Unable to connect to the mail server using Atmail: Relay access denied

Created:

2016-11-16 12:43:35 UTC

Modified:

2017-05-25 13:42:26 UTC

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Unable to connect to the mail server using Atmail: Relay access denied

Applicable to:

  • Plesk 11.0 for Linux
  • Plesk 12.0 for Linux

Symptoms

Users are no longer able to connect to a relay server for outgoing mail through the Atmail webmail on Plesk 12.

There are several authentication failures and disconnect messages in /var/log/maillog :

Feb 26 05:00:29 host postfix/smtpd[11388]: NOQUEUE: reject: RCPT from localhost.localdomain[127.0.0.1]: 554 5.7.1 <username@domain.tld>: Relay access denied; from=<username@example.com> to=<username@domain.tld> proto=ESMTP helo=<webmail.example.com>
Feb 26 05:00:29 host courier-imapd: DISCONNECTED, user=username@example.com, ip=[::ffff:127.0.0.1], headers=0, body=0, rcvd=45, sent=380, time=0
Feb 26 05:00:29 host postfix/smtpd[11388]: lost connection after RCPT from localhost.localdomain[127.0.0.1]
Feb 26 05:00:29 host postfix/smtpd[11388]: disconnect from localhost.localdomain[127.0.0.1]

This error appears while trying to send a message using Atmail webmail:

Could not send message to SMTP server. Check you have access to send messages via the server and that all To/CC/BCC addresses are valid 
Error: SMTP Server rejected email. Returned:554 5.7.1 <testing@domain.com>: Relay access denied

OR

Unable to install Atmail :

Warning: following component(s) not found:  'psa-atmail'

Cause

Atmail webmail is no longer supported by Plesk.

Resolution

Consider switching to supported Horde and Roundcube webmail clients:

Install supported webmail client using autoinstaller and switch domains to it in Home > Subscriptions > Domain.tld > Mail > Mail Settings - Webmail

Additional information

The following KB article can also be useful:

213364749 Cannot send mail using Outlook: 554 5.7.1 : Client host rejected: Access denied.

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