Issue error 551 requires authentication

[mudassar]

Server operating system version

ubuntu 22

Plesk version and microupdate number

obsidian 18.0.47

I am trying to send emails and when I send emails to any email addresses on a windows server with plesk (that is also mine) i receive the error:
"said: 551 This mail server
requires authentication before sending mail from a locally hosted domain.
Please reconfigure your mail client to authenticate before sending mail."

The server where I am sending the emails from is a completely different server and IP. Emails are received by gmail with no problem, SPF, DKIM and DMARC passed.

Is there a setting issue on my windows server somewhere?

 

[mudassar]

the message attached on the failure reply has the following header:

spf=pass (sender IP is 0000:0000:0000:0000:0000:0000:0000:0001) [email protected] smtp.helo=webmail.domain.co.uk
Received-SPF: pass (fervent-mayer: connection is authenticated)
Received: from unknown (HELO webmail.domain.co.uk)
(0000:0000:0000:0000:0000:0000:0000:0001)
by 0000:0000:0000:0000:0000:0000:0000:0001 with ESMTPSA
(TLS_AES_256_GCM_SHA384 encrypted, authenticated); 29 Dec 2022 11:19:10 +0000

 

[alapshin]

Hello @mudassar.
There are might be several causes of the issue:
1. The sender's domain exists on the destination server and is considered as a local domain.
In this case sender's domain should be deleted from the receiving mail server.

2. Email was sent from a user who did not authenticate before sending mail.
Here MailEnable should be tuned by disabling address spoofing:
Go to MailEnable > Servers > localhost > Services and Connectors > right click on SMTP > Properties.
Security tab > Address spoofing > set to Anyone can spoof sender address > OK




If aforementioned solutions will not help please check this article SMTP Connector Inbound Response Codes section "551 This mail server requires authentication before sending mail from a locally hosted domain."

 

[mudassar]

Hello @mudassar.
There are might be several causes of the issue:
1. The sender's domain exists on the destination server and is considered as a local domain.
In this case sender's domain should be deleted from the receiving mail server.

2. Email was sent from a user who did not authenticate before sending mail.
Here MailEnable should be tuned by disabling address spoofing:
Go to MailEnable > Servers > localhost > Services and Connectors > right click on SMTP > Properties.
Security tab > Address spoofing > set to Anyone can spoof sender address > OK

View attachment 22209


If aforementioned solutions will not help please check this article SMTP Connector Inbound Response Codes section "551 This mail server requires authentication before sending mail from a locally hosted domain."

how do i access the mailenable control via linux server?

 

[alapshin]

Changes and checks that were mentioned should be performed on Windows server. Since message "551 This mail server requires authentication..." comes from recipient.