Question Plesk Onyx Smarthost / SMTP Relay Config

[Sally1]

Hello,


i use a private vpn service to route all my internet traffic over it. I get problems, with my mail accounts like Gmail, Outlook, GMX when sending from Mac Mail.


When i try to verify i get the message:


The Server response was unknown ( 46.x.x.x ) Client Host rejected: Access denied



I was wondering how can i configure in plesk centos my postfix mail server as smarthost / relay for all my mail accounts?


Do i have to whitelist the External VPN IP, what is the best (most secure) way to do this?



I use Plesk Onyx 17.5.3 with Centos 6.9.



I have installed Postfix and IMAP/POP3 Server is Dovecot


Enable SMTP service on Port 587 on all IP addresses is marked.


Outgoing mail mode:


Send from domain IP addresses and use domain names in SMTP greeting



Relay Options:


Authorization is required for SMTP



Thanks a Lot!


best Regards

 

[garcue]

Hi Sally1,
Check SPF and DKIM settings

Shows the output of the logs

Perform a test on this page to see what problems your email server has

==> Newsletters spam test by mail-tester.com​

 

[Sally1]

Hi Sally1,
Check SPF and DKIM settings

Shows the output of the logs

Perform a test on this page to see what problems your email server has

==> Newsletters spam test by mail-tester.com​

Hello Garcue,

thanks for the information. I checked, and the problems seems to be here:


Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address.
Some companies such as AOL will reject any message sent from a server without rDNS, so you must ensure that you have one.
You cannot associate more than one domain name with a single IP address.

Your IP address 82.x.x.x is associated with the domain s18xxxxxx.onlinehome-server.info.
Nevertheless your message appears to be sent from domain.com.

You may want to publish a pointer (PTR type) DNS record with a value of domain.com or use s18xxxxxx.onlinehome-server.info as hostname in your mail software

Here are the tested values for this check:

· IP: 82.x.x.x

· HELO: domain.com

· rDNS: s18xxxxxx.onlinehome-server.info



I have in cloudflare the following settings:


domain.com


v=spf1 +a +mx +a:s18xxxxxx.onlinehome-server.info ip4:82.x.x.x include:servers.mcsv.net -all


default._domainkey


v=DKIM1; p=MIGfMA0GXXXX


_dmarc


v=DMARC1; p=none


When I use hostname s18xxxxxx.onlinehome-server.info in my mail Client I get the message unable to verify account, the certificate of the server is invalid

When I use as hostname mail.domain.com I can verify.

Should in the SPF Record be the Hostname s18xxxxxx.onlinehome-server.info or the Hostname mail.domain.com?

Thx
Salli

 

[garcue]

Okay, start by generating a "PTR" pointer in your DNS so that the domain is resolved if you ask for ip

 

[Sally1]

Hi Garcue,

thanks, will update the PRT Record. What do I have then to do then that the Postfix Mailserver forward Relay all my Mail?

Thx
Sallida

 

[garcue]

Hello again Sally1,

Are you referring to what you have to do to be forwarded the mails that were not sent at the time?

 

[Sally1]

Hello Garcure,

I refer to my Mail Accounts like Gmail, how I can relay them with my Mail Server.

Thx
Sallida

 

[garcue]

Are you still unable to receive mails sent from gmail accounts? What do the log files say?