Resolved Gmail - undelivered mails, mails going to the spam folder

[hnizdod]

Hello,
I have a problem with sending emails from my server.

When I try to send an email to a gmail address, it return an error:
Undelivered Mail Returned to Sender

This is the mail system at host alfa.nester.cz.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email protected]>: host gmail-smtp-in.l.google.com[64.233.167.26]
    said: 550-5.7.1 [51.75.64.220      12] Our system has detected that this
    message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam
    sent to Gmail, 550-5.7.1 this message has been blocked. Please visit
    550-5.7.1  https://support.google.com/mail/?p=UnsolicitedMessageError 550
    5.7.1  for more information. k3si71537680wrm.213 - gsmtp (in reply to end
    of DATA command)
Reporting-MTA: dns; alfa.nester.cz
X-Postfix-Queue-ID: 31327164
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Fri, 25 Jan 2019 15:24:31 +0100 (CET)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [51.75.64.220      12] Our system has detected
    that this message is 550-5.7.1 likely unsolicited mail. To reduce the
    amount of spam sent to Gmail, 550-5.7.1 this message has been blocked.
    Please visit 550-5.7.1
    https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for
    more information. k3si71537680wrm.213 - gsmtp

SERVER DETAILS
Hostname: alfa.nester.cz
IP address: 51.75.64.220 (rDNS: alfa.nester.cz)
Hosting: OVH (VPS 2018)
Domains: all domains on my server have this problem (for example: nester.cz)

Newly bought VPS. I hope the IP is not blacklisted.

TESTS
mxtoolbox:

Expand/Collapse Block: Domain health

Domain health

Expand/Collapse Block: Domain DNS servers

Domain DNS servers:

Expand/Collapse Block: Domain/IP blacklist check

Blacklist check:

Expand/Collapse Block: Domain SMTP diagnostics

Domain SMTP diagnostics:

mail-tester.com

Expand/Collapse Block: mail-tester.com

Spam Test Result

Do anybody know how to fix this problem? I tried everything, that I know.
Everything is fine on tests and i really don't know how to solve this problem.

Thank you very much for any answers.

 

[hnizdod]

Mail log:

Jan 25 15:24:13 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19461, TLS, session=</gjIFEmAPKR/AAAB>
Jan 25 15:24:13 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=38, sent=498
Jan 25 15:24:13 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19464, TLS, session=<IBXLFEmAQKR/AAAB>
Jan 25 15:24:13 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=44, sent=623
Jan 25 15:24:31 alfa postfix/smtpd[19484]: connect from localhost.localdomain[127.0.0.1]
Jan 25 15:24:31 alfa postfix/smtpd[19484]: 31327164: client=localhost.localdomain[127.0.0.1], sasl_method=PLAIN, [email protected]
Jan 25 15:24:31 alfa postfix/cleanup[19488]: 31327164: message-id=<[email protected]>
Jan 25 15:24:31 alfa check-quota[19490]: Starting the check-quota filter...
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: handlers_stderr: SKIP
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: SKIP during call 'check-quota' handler
Jan 25 15:24:31 alfa spf[19492]: Starting the spf filter...
Jan 25 15:24:31 alfa spf[19492]: SPF status: PASS
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: handlers_stderr: PASS
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: PASS during call 'spf' handler
Jan 25 15:24:31 alfa dk_sign[19493]: Starting the dk_sign filter...
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: handlers_stderr: PASS
Jan 25 15:24:31 alfa /usr/lib64/plesk-9.0/psa-pc-remote[17590]: PASS during call 'dd51-domainkeys' handler
Jan 25 15:24:31 alfa postfix/qmgr[17633]: 31327164: from=<[email protected]>, size=615, nrcpt=1 (queue active)
Jan 25 15:24:31 alfa postfix/smtpd[19484]: disconnect from localhost.localdomain[127.0.0.1]
Jan 25 15:24:31 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19496, TLS, session=<UUXmFUmATqR/AAAB>
Jan 25 15:24:32 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=505, sent=667
Jan 25 15:24:32 alfa postfix/smtp[19494]: 31327164: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[64.233.167.26]:25, delay=1.6, delays=0.66/0.04/0.46/0.48, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[64.233.167.26] said: 550-5.7.1 [51.75.64.220      12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1  https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for more information. k3si71537680wrm.213 - gsmtp (in reply to end of DATA command))
Jan 25 15:24:32 alfa postfix/cleanup[19488]: D66472980: message-id=<[email protected]>
Jan 25 15:24:32 alfa postfix/qmgr[17633]: D66472980: from=<>, size=3790, nrcpt=1 (queue active)
Jan 25 15:24:32 alfa postfix/bounce[19498]: 31327164: sender non-delivery notification: D66472980
Jan 25 15:24:32 alfa postfix/qmgr[17633]: 31327164: removed
Jan 25 15:24:32 alfa postfix-local[19502]: postfix-local: from=MAILER-DAEMON, [email protected], dirname=/var/qmail/mailnames
Jan 25 15:24:32 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19504, TLS, session=<Bdr1FUmAUqR/AAAB>
Jan 25 15:24:32 alfa spamassassin[19503]: cannot get sender domain
Jan 25 15:24:32 alfa spamassassin[19503]: Unable to intialize spamassassin mail handler
Jan 25 15:24:32 alfa postfix-local[19502]: Error during 'spam' handler
Jan 25 15:24:33 alfa dk_check[19505]: cannot get sender domain
Jan 25 15:24:33 alfa dk_check[19505]: Unable to intialize dk_check mail handler
Jan 25 15:24:33 alfa postfix-local[19502]: Error during 'dd52-domainkeys' handler
Jan 25 15:24:33 alfa dmarc[19506]: cannot get sender domain
Jan 25 15:24:33 alfa dmarc[19506]: Unable to intialize dmarc mail handler
Jan 25 15:24:33 alfa postfix-local[19502]: Error during 'dmarc' handler
Jan 25 15:24:33 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=70, sent=664
Jan 25 15:24:33 alfa dovecot: service=lda, [email protected], ip=[]. msgid=<[email protected]>: saved mail to INBOX
Jan 25 15:24:33 alfa postfix/pipe[19501]: D66472980: to=<[email protected]>, relay=plesk_virtual, delay=0.23, delays=0.03/0.01/0/0.19, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Jan 25 15:24:33 alfa postfix/qmgr[17633]: D66472980: removed
Jan 25 15:24:33 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19511, TLS, session=<noX8FUmAVqR/AAAB>
Jan 25 15:24:33 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=316, sent=1567
Jan 25 15:24:34 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19517, TLS, session=<3SIOFkmAWqR/AAAB>
Jan 25 15:24:34 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=126, sent=803
Jan 25 15:24:35 alfa dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=19521, TLS, session=<TUcYFkmAXqR/AAAB>
Jan 25 15:24:35 alfa dovecot: service=imap, [email protected], ip=[127.0.0.1]. Logged out rcvd=608, sent=5869

 

[themew]

For Google to accept your email (I also use OVH cloud servers), you also need to pass DKIM and DMARC besides SPF which looks good.

Once you pass all 3, send an email to your Gmail address and send a copy of the headers that include all 3 (SPF, DKIM and DMARC) to

Report a problem with a message - Gmail Help

Wait about 24 hours and your messages should pass through to Gmail.

Also, create an account at Gmail Postmaster tools to monitor your health with Gmail

Gmail Postmaster Tools

 

[hnizdod]

I reported a problem, so I hope it will be fixed.
I'll let you know if it helped or not.

Thank you

 

[hnizdod]

For Google to accept your email (I also use OVH cloud servers), you also need to pass DKIM and DMARC besides SPF which looks good.

Once you pass all 3, send an email to your Gmail address and send a copy of the headers that include all 3 (SPF, DKIM and DMARC) to

Report a problem with a message - Gmail Help

Wait about 24 hours and your messages should pass through to Gmail.

Also, create an account at Gmail Postmaster tools to monitor your health with Gmail

Gmail Postmaster Tools

It didn't help. Emails sent from my server are still being delivered to the spam folder. :/

Email headers is good:
(censored email addresses because of spam)

Delivered-To: [email protected]
Received: by 2002:a9d:6405:0:0:0:0:0 with SMTP id h5csp3730954otl;
        Mon, 28 Jan 2019 10:00:30 -0800 (PST)
X-Google-Smtp-Source: ALg8bN7LGCrDLQC50fgpMrxyWpCcNNiW92a7ftFS+ZrOFNgQWavRXq2USp8FlVQMQXPFsUknvDSO
X-Received: by 2002:a1c:ac42:: with SMTP id v63mr17498848wme.119.1548698430009;
        Mon, 28 Jan 2019 10:00:30 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1548698430; cv=none;
        d=google.com; s=arc-20160816;
        b=ABGDACuUfb60A/Sy7n5cK25mdWfxAZV70EadlhxpsYgeHH/9Uzrbz+SkHcYaZ1Ny5U
         0j0mCeqfA6c4eeWFgwimU4bis1eKZRk6gcP3jpM6q5avB4b7wWQ7ua2BnLWFplsFVAj7
         Gru47zV8pK9cRdUd4E8SNS7h8bQTDlrzCPKjkMgPHAYk+xGb1W/0+L/zKGOj51af74T+
         4gOKV4/a+avvM89dDJLTfvHPqWrwDO3m7jrfhASEryEDgmrKt5jtjhli4BGj5TKRentN
         FH7TsFeqgBJ6Iq65xb/19nchwmOyWmd9jfxslcbm8sw0GSyvvcSYAvyR1cH07+IUZi5n
         5+Fw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=content-language:content-transfer-encoding:mime-version:user-agent
         :date:message-id:subject:from:to:dkim-signature;
        bh=m+QOCZGxPutw1J1fEal/VMk18i3uBJWjUTaEj+fwEbg=;
        b=tSw7EInb8q+DtqmSfS2EbuAArVfQmY8SEOHXnbh92UM7Ho6TB59mhtoQpL5DAIWOcm
         ZZhFD6/fPalpJrEw27G7uw1CZkZDyK3gBhcohVnED0UGyYhrD45tS/sYJIVJJDzsFVjb
         GwLa3rmL5B3xYH7WLoucQQw+V8FCjZl8/bMjNr0sti1C6QSfrOQa2aY2/NTIzg2GnbB0
         7KCozHY4/TyAnLRWCSRjnasfz7TEdQXAqMW3HU48+JcKsL+Ng/czCmCzFuFr4VVuoNr9
         6Pmo8ADPJj8hy2nmeZacs1eHXsA8JemUuNmqdK1r2rurwCZ1ZlIcuCfUvT0+AlSFGWNy
         SHgg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@censored header.s=default header.b=ctnbLhlo;
       spf=pass (google.com: domain of censored designates 51.75.64.220 as permitted sender) smtp.mailfrom=censored;
       dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=censored
Return-Path: <censored>
Received: from alfa.nester.cz (alfa.nester.cz. [51.75.64.220])
        by mx.google.com with ESMTPS id d127si63737wmc.146.2019.01.28.10.00.29
        for <[email protected]>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Mon, 28 Jan 2019 10:00:29 -0800 (PST)
Received-SPF: pass (google.com: domain of censored designates 51.75.64.220 as permitted sender) client-ip=51.75.64.220;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@censored header.s=default header.b=ctnbLhlo;
       spf=pass (google.com: domain of info@censored designates 51.75.64.220 as permitted sender) smtp.mailfrom=censored;
       dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=censored
Received: from [192.168.0.100] (unknown [46.183.60.117]) by alfa.nester.cz (Postfix) with ESMTPSA id B89BF277A for <[email protected]>; Mon, 28 Jan 2019 19:00:27 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=censored; s=default; t=1548698428; bh=m+QOCZGxPutw1J1fEal/VMk18i3uBJWjUTaEj+fwEbg=; l=39; h=To:From:Subject; b=ctnbLhlo7sqb5deNwQkY6ZPGv+NMKczzbFklVzmlNta5qGzaU5o4albDnctkHRPHB
     MniOGlGrliVccC/OwPTY0Zci7zgxYoczv7yavvTwpveTOx4Mp93/YlVre8Pcpkt4/B
     CF85H7SXfsRaqAosz/61F8sFLlNLFssqDxeINuyw=
Authentication-Results: alfa.nester.cz;
        spf=pass (sender IP is 46.183.60.117) smtp.mailfrom=censored smtp.helo=[192.168.0.100]
Received-SPF: pass (alfa.nester.cz: connection is authenticated)
To: [email protected]
From: "censored" <censored>
Subject: Testovací email
Message-ID: <censored>
Date: Mon, 28 Jan 2019 19:00:26 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: cs
X-PPP-Message-ID: <[email protected]>
X-PPP-Vhost: censored

Dobr� den,
tohle je testovac� email.

 

[themew]

Seems you've got errors with your MX and Dmarc settings




Also looking at your DNS entries


Your MX record looks different than your email header.

Check your full records here > Threat Intelligence Platform – Website Analysis of nester.cz

Check your site again using MX Lookup Tool - Check your DNS MX Records online - MxToolbox and you should find the answer you need.

 

[hnizdod]

Seems you've got errors with your MX and Dmarc settings

View attachment 15219
View attachment 15220

Also looking at your DNS entries

View attachment 15221
Your MX record looks different than your email header.

Check your full records here > Threat Intelligence Platform – Website Analysis of nester.cz

Check your site again using MX Lookup Tool - Check your DNS MX Records online - MxToolbox and you should find the answer you need.

I fixed DMARC and changed domain MX record to alfa.nester.cz.
I actually don't know how to fix this error:



The subdomain has a published A record.
I think they mean MX record, but MX record is set for whole domain (nester.cz). I shouldn't set MX record for a subdomain, right?

Thank you, but at this time, all emails are still being delivered to the spam folder.
Is possible the IP addresss of the server is blacklisted? I really don't know what else it can be. Maybe i just have to wait, but changes in the DNS are published.

Actual email header:

Delivered-To: [email protected]
Received: by 2002:a05:6102:403:0:0:0:0 with SMTP id d3csp4887050vsq;
        Tue, 29 Jan 2019 09:57:00 -0800 (PST)
X-Google-Smtp-Source: ALg8bN66NepI8z3BfBpRlTPbfux+JJcQ/uJ8OiXcBA3RXhWQSYwZ4yKKgONJ7h3zJ+5yNR2XzDH1
X-Received: by 2002:a1c:c303:: with SMTP id t3mr20793669wmf.94.1548784620570;
        Tue, 29 Jan 2019 09:57:00 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1548784620; cv=none;
        d=google.com; s=arc-20160816;
        b=wlQQNNk/HsuKVuErdZL0Oo/MLVFRu5B4jchbK6K52WxmFEvHbk/531jr9mL7U4xEfG
         9U4LpvYrzV8JCxSlFAFROAtjEqXEsAju6uR8GMac01HQxelMItCd7q724Q5hVOrJ4hcE
         TWjUIeSI7UwL3DRMLVUWaxDSpvRl9YTMyjDO1Ud0nxCzaubNLJKoNZ6UlLsaoWYoqcNa
         sfr+nmU8y7lPIM0KcuNwOJM0sb9GD4eUL8WkTr32WPtFjiKDq+yaIhVdbci/qUapb82l
         cEDCGf6NoKe2VolOCl9YEvIRQ+A06E73tm2ey/BJ32lC+z1BH3bi2b/Rzn6//JjtPKxb
         NApg==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=content-language:content-transfer-encoding:mime-version:user-agent
         :date:message-id:subject:from:to:dkim-signature;
        bh=uh/4oybIS+hqbsmum9Y0nHPTpzHcBy1fM/1/iopnkbU=;
        b=ZOnO54SRbcNTrYqv3trHU51Ejzn9dWvwhJyfn8TaKuEief4zuoRqO6W5EFvwIQl9dG
         EkUtDZIKix8R94GNJCynQf/V90Tt85n9mU+HMYyoZZ/35bzgDELJeeol0FOnj70dXN4U
         yH6c1UmZ+Dd6jP1ePdT3Ps4Hjvx6bn6PmHiRgLDQb/EbQwk2uFIIGITXchZ2cLx42TKq
         69ovPQ0nJr7QmLRo1g0ktmWhvu+kYMaIhjk1uzwFuLGHjw75lSKmi3jNRVVR8wPUrK+S
         Ql3+zHNqfbwwvnJ4Xlp8hpF/PMPKL0e8J9jJbf9cr16exJRA3WsyqVZ33Dz7eSf0Gn7P
         KCbg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass [email protected] header.s=default header.b=Y+DyvvaH;
       spf=pass (google.com: domain of [email protected] designates 51.75.64.220 as permitted sender) [email protected];
       dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=nester.cz
Return-Path: <[email protected]>
Received: from alfa.nester.cz (alfa.nester.cz. [51.75.64.220])
        by mx.google.com with ESMTPS id r14si44016974wrv.147.2019.01.29.09.56.59
        for <[email protected]>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 29 Jan 2019 09:57:00 -0800 (PST)
Received-SPF: pass (google.com: domain of [email protected] designates 51.75.64.220 as permitted sender) client-ip=51.75.64.220;
Authentication-Results: mx.google.com;
       dkim=pass [email protected] header.s=default header.b=Y+DyvvaH;
       spf=pass (google.com: domain of [email protected] designates 51.75.64.220 as permitted sender) [email protected];
       dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=nester.cz
Received: from [192.168.0.100] (unknown [46.183.60.117]) by alfa.nester.cz (Postfix) with ESMTPSA id 5DAC11E72 for <[email protected]>; Tue, 29 Jan 2019 18:56:59 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nester.cz; s=default; t=1548784619; bh=uh/4oybIS+hqbsmum9Y0nHPTpzHcBy1fM/1/iopnkbU=; l=27; h=To:From:Subject; b=Y+DyvvaHsHUjHHZpXtCK9y57fY+d2a709/yJNde5sJsncP+cAX8g1jyjOGmKNivmH
     vt+8rumG0rHSGfnQdx0mG3rRvJaqFdCOk1vM7zrWBzUMrT7PFJpmXLlRBK6USQEXs7
     Z4CTIXztaGD20NtpWjLfOm1NBAAQPYTCDNd9NpDU=
Authentication-Results: alfa.nester.cz;
        spf=pass (sender IP is 46.183.60.117) [email protected] smtp.helo=[192.168.0.100]
Received-SPF: pass (alfa.nester.cz: connection is authenticated)
To: [email protected]
From: "Administrátor Nester.cz" <[email protected]>
Subject: Ahoj jak je
Message-ID: <[email protected]>
Date: Tue, 29 Jan 2019 18:56:59 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: cs
X-PPP-Message-ID: <[email protected]>
X-PPP-Vhost: nester.cz

Tohle je testovac� zpr�va

 

[hnizdod]

Update

Emails are being delivered to the spam folder also in Outlook.

It's says something about dkim fail. Maybe unvalid dkim? But gmail says valid.

smtp.mailfrom=nester.cz; outlook.com; dkim=fail (body hash did not verify)

Received: from SN1NAM01HT023.eop-nam01.prod.protection.outlook.com
(2603:10a6:209:82::47) by AM5PR0801MB1249.eurprd08.prod.outlook.com with
HTTPS via AM6P192CA0070.EURP192.PROD.OUTLOOK.COM; Tue, 29 Jan 2019 18:25:32
+0000
Received: from SN1NAM01FT048.eop-nam01.prod.protection.outlook.com
(10.152.64.52) by SN1NAM01HT023.eop-nam01.prod.protection.outlook.com
(10.152.65.116) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.1580.10; Tue, 29 Jan
2019 18:25:32 +0000
Authentication-Results: spf=pass (sender IP is 51.75.64.220)
smtp.mailfrom=nester.cz; outlook.com; dkim=fail (body hash did not verify)
header.d=nester.cz;outlook.com; dmarc=pass action=none header.from=nester.cz;
Received-SPF: Pass (protection.outlook.com: domain of nester.cz designates
51.75.64.220 as permitted sender) receiver=protection.outlook.com;
client-ip=51.75.64.220; helo=alfa.nester.cz;
Received: from alfa.nester.cz (51.75.64.220) by
SN1NAM01FT048.mail.protection.outlook.com (10.152.64.249) with Microsoft SMTP
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MIME-Version: 1.0

Dobrý den
tohle je testovacà zpráva

Děkujeme za odpověď.

 

[Bitpalast]

A) The IP is blacklisted with rbl.rbldns.ru. Normally this should not cause GMail to reject mail, but maybe it is a good idea to have it removed from there anyway, you never know .... See the first FAQ entry on General questions for more information on this.

But this will not solve your issue. The following (B) will likely solve it:

B) If webmail (local mail) is sent by Postfix and the myhostname variable is not set in /etc/postfix/main.cf, some recipients won’t accept the mail, because it seems to be coming from localhost.localdomain.This domain cannot be checked against the public IP, because the public IP resolves to a public host name, not to localhost.localdomain. See the Outlook headers in your previous post and you will find exactly that situation.

Edit /etc/postfix/main.cf and add this line (place your hostname without the brackets there)
myhostname = <your host name>

Afterwards run
# service postfix restart
so that the new values are applied. Now test again.

 

[hnizdod]

OK, I did it. Thanks, but all emails are stil being delivered to the spam folder on gmail and outlook.

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MIME-Version: 1.0

Ahoj, jak je?

 

[themew]

Your MX record is mail.nester.cz but your reverse is alfa.nester.cz which is shown in the above email header.

Run your headers through Newsletters spam test by mail-tester.com and the Threat Intelligence Platform - Protection Tools, Services, API's for detailed info about your email headers.

You'll soon see the issues with the header you pasted above.

 

[hnizdod]

Your MX record is mail.nester.cz but your reverse is alfa.nester.cz which is shown in the above email header.

Run your headers through Newsletters spam test by mail-tester.com and the Threat Intelligence Platform - Protection Tools, Services, API's for detailed info about your email headers.

You'll soon see the issues with the header you pasted above.

Mxtoolbox is saying that my MX record is alfa.nester.cz:


10/10 Spam Test Result

 

[Bitpalast]

Received: from [192.168.0.100] (unknown [46.183.60.117])
by alfa.nester.cz (Postfix)

is showing that the sender is not set correctly.

 

[hnizdod]

And how can i change the "received: from" value?
I edited it in the /etc/postfix/main.cf file and restarted the post service, but it's still same from the webmail. When I'm sending email from Thunderbird, there is that "Received: from [192.168.0.100] (unknown [46.183.60.117]) ".

# INTERNET HOST AND DOMAIN NAMES
#
# The myhostname parameter specifies the internet hostname of this
# mail system. The default is to use the fully-qualified domain name
# from gethostname(). $myhostname is used as a default value for many
# other configuration parameters.
#
myhostname = alfa.nester.cz
#myhostname = virtual.domain.tld

 

[Bitpalast]

My suggestion is to first test with webmail again, because this is what you did at first. It should work with sending mails from webmail now, because there server settings should be correct now and give the recipient mail server the information it needs to let the mail pass.

 

[hnizdod]

It's still same.

Received: from webmail.nester.cz (localhost.localdomain [127.0.0.1])

Received: from SN1NAM01HT214.eop-nam01.prod.protection.outlook.com
(2603:10a6:6:14::48) by DB6PR0801MB1253.eurprd08.prod.outlook.com with HTTPS
via DB6PR05CA0035.EURPRD05.PROD.OUTLOOK.COM; Wed, 30 Jan 2019 14:26:49 +0000
Received: from SN1NAM01FT034.eop-nam01.prod.protection.outlook.com
(10.152.64.52) by SN1NAM01HT214.eop-nam01.prod.protection.outlook.com
(10.152.65.18) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.1580.10; Wed, 30 Jan
2019 14:26:49 +0000
Authentication-Results: spf=pass (sender IP is 51.75.64.220)
smtp.mailfrom=nester.cz; outlook.com; dkim=pass (signature was verified)
header.d=nester.cz;outlook.com; dmarc=pass action=none header.from=nester.cz;
Received-SPF: Pass (protection.outlook.com: domain of nester.cz designates
51.75.64.220 as permitted sender) receiver=protection.outlook.com;
client-ip=51.75.64.220; helo=alfa.nester.cz;
Received: from alfa.nester.cz (51.75.64.220) by
SN1NAM01FT034.mail.protection.outlook.com (10.152.64.194) with Microsoft SMTP
Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
15.20.1580.10 via Frontend Transport; Wed, 30 Jan 2019 14:26:48 +0000
X-IncomingTopHeaderMarker: OriginalChecksum:FF46CE160047285B3577E1EF912333898404E6F533604744A74DCC7D8AA69607;UpperCasedChecksum:176EB1F64E7B15E54EE1AB4D17FFC1A2E259B8E13BB633D8E1906CEEE3C16951;SizeAsReceived:1215;Count:16
Received: from webmail.nester.cz (localhost.localdomain [127.0.0.1])
by alfa.nester.cz (Postfix) with ESMTPSA id 3D4AD277C
for <[email protected]>; Wed, 30 Jan 2019 15:26:47 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nester.cz;
s=default; t=1548858407;
bh=g3zLYH4xKxcPrHOD18z9YfpQcnk/GaJedfustWU5uGs=; l=6;
h=From:To:Subject;
b=GHxVBBoQdeowIQzBlBjFgz7VeNYJbuGesn4c3OIGHQWAmiAX3TIE0sIVxu1jbAkkp
iHdnQ0+c3MAEGVwTBd5AOKZ99vhKw9S5N6LmLLMyU6RTB+eCKJyWAFHgwwCgYR+qoA
1q/wwn0mxYe0FyCOug+YC1oID5wCCTunT3E23LvM=
Authentication-Results-Original: alfa.nester.cz; spf=pass (sender IP is
127.0.0.1) [email protected] smtp.helo=webmail.nester.cz
Received-SPF: pass (alfa.nester.cz: connection is authenticated)
Content-Type: text/plain; charset="US-ASCII"; format=flowed
Content-Transfer-Encoding: 7bit
Date: Wed, 30 Jan 2019 15:26:47 +0100
From: [email protected]
To: [email protected]
Subject: =?UTF-8?Q?testovac=C3=AD_email?=
Message-ID: <[email protected]>
X-Sender: [email protected]
User-Agent: Roundcube Webmail/1.3.6
X-PPP-Message-ID: <[email protected]>
X-PPP-Vhost: nester.cz
X-IncomingHeaderCount: 16
Return-Path: [email protected]
X-MS-Exchange-Organization-ExpirationStartTime: 30 Jan 2019 14:26:48.8158
(UTC)
X-MS-Exchange-Organization-ExpirationStartTimeReason: OriginalSubmit
X-MS-Exchange-Organization-ExpirationInterval: 2:00:00:00.0000000
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X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-PublicTrafficType: Email
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X-MS-TrafficTypeDiagnostic: SN1NAM01HT214:
X-MS-Exchange-EOPDirect: true
X-Sender-IP: 51.75.64.220
X-SID-PRA: [email protected]
X-SID-Result: PASS
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MIME-Version: 1.0

test

 

[Bitpalast]

I think that the source code is good enough this way. It cannot really be improved and should not lead to a spam suspicion. Have you tried to send a real mail instead of a test mail through it? Maybe it is simple the test content of the mail that triggers a filter.

Another thing you can try is to register with Microsoft SNDS to see whether Microsoft thinks it needs to block your mails:
Sign in to your Microsoft account
It could be that your server is doing things fine, and your mail is not spam, but that part of the network your IP is in is blocked. They frequently do this (at last it has occured here several times). In that case it is possible to apply for an exempt rule from the blocking, which is normally done within 12 hours. We've seen the same behavior with clean servers with German Telekom, too.

 

[hnizdod]

Yep, I tried.
I tried everything I think. I tried contacting google for more informations (they didn't answered me) and I also contacted OVH support, but they are completly silent. I didn't get any answer from OVH. I think it's time to change hosting company... I'm really mad about that emails.

 

[danami]

I manage a lot of servers at OVH. I haven't had any problems sending to Gmail when the server is properly configured. Sometimes you could get a bad IP that was used by a spammer previously and is blocked on a bunch of RBLs but then its just a matter of going to the RBLs and requesting removal. Any reputable RBL should have an easy process for getting removed.

This is a good tool for checking your IPs against multiple RBLs:
MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool

 

[hnizdod]

I manage a lot of servers at OVH. I haven't had any problems sending to Gmail when the server is properly configured. Sometimes you could get a bad IP that was used by a spammer previously and is blocked on a bunch of RBLs but then its just a matter of going to the RBLs and requesting removal. Any reputable RBL should have an easy process for getting removed.

This is a good tool for checking your IPs against multiple RBLs:
MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool

I understand, but how can I know what's wrong when all tests (mailer test, port25, ...) are saying that everything is fine?
Plesk should have valid configuration of mail server from installation, right?