SMTPAddressFailedException: 550 5.7.54 SMTP; Unable to relay recipient in non-accepted domai

[Jens Brockhaus]

Hello,
in the outgoingmail.log i found this error. The to-adress is null.
How can i solve this problem?
Kimd regards
Jens

Sending mailitem To='null' Subject='Security alert for:

[Jens Brockhaus]

Hello Marc,
thanks for your answer. But in this case the mailitem has no to-adress. How can i change this?
Kind regards
Jens

[Marc - Devoteam]

Where is this message coming from, what issue is triggering this error?

Is there a user on that issue it want's to sent email to without an email address?

What are the settings of system setting Outgoing Mail, or is the outgoing mail disabled?

[Jens Brockhaus]

Hello Marc,
i found this message in the outgoingmail.log. It is a message from the mail error queue.
Outgoing mail is enabled. Do you know from which user this messages are sent?
Kind regards
Jens

[Marc - Devoteam]

No, this should be in your configuration.

Documentation on this topic, https://confluence.atlassian.com/adminjiraserver/configuring-an-smtp-mail-server-to-send-notifications-947184044.html 

[Marc - Devoteam]

Hi @Jens Brockhaus 

Could be related to this, https://confluence.atlassian.com/jirakb/jira-server-throws-smtpaddressfailedexception-when-sending-email-306348278.html 

SMTP server issues, this can be security settings, or even as simple as invalid username and password.