Unable to send emails or create a mailbox: Error: mailmng-outgoing failed: ERROR:outgoing:mails.domain_id may not be NULL

Plesk for Linux kb: technical ABT: Group A

Applicable to:

Unable to send emails, the following error might be found in the log file /var/log/maillog:

CONFIG_TEXT: There was an error sending your message: Server is not accepting SMTP connections. Error in mail clients can appear during sending emails: 554 5.7.0 The message could not be sent. You are not allowed to use sendmail utility. Errors can appear when emails are sent to one of the mailboxes of domain example.com: "550 5.1.1 mailbox@example.com: Recipient address rejected: User unknown in virtual mailbox table"
Unable to send emails with PHP mail even though sendmail is enabled in Plesk, the following error is shown in the log file /var/log/maillog:

CONFIG_TEXT: plesk sendmail[7372]: handlers_stderr: ERROR:__main__:Rejecting message: system user uid='11088' is not allowed to send mail
plesk sendmail[7372]: handlers_stderr: DATA REPLY:554:5.7.0 Your message could not be sent. The user sysuser is not allowed to send email.#012REJECT
plesk sendmail[7372]: REJECT during call 'limit-out' handler

Inconsistency in the Plesk database and/or the internal SQLite database controlling outgoing mail limits.

Note: The solution described in this article requires root access, if it's not available please contact the hosting service provider

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Connect to the server via SSH
In case there is any customization in the Mail Server configuration files, back them up:

For Postfix:

# cp -rp /etc/postfix{,.old}

For Qmail:

# cp -rp /var/qmail/control{,.old}
Back up the Plesk databases:

# plesk db dump psa apsc > psa_apsc_backup.sql
Repair any Plesk database inconsistency:

# plesk repair db -y
Repair any mail inconsistencies:

# plesk repair mail -y
If the issue persists, back up the outgoing mail limits database:

# mv /var/lib/plesk/mail/outgoing/data.db{,_bk}
Repair outgoing limits configuration:

On RHEL/CentOS based systems:

# /usr/lib64/plesk-9.0/remote_mail_restore/mail_outgoing_restore

On Debian/Ubuntu based systems:

# /usr/lib/plesk-9.0/remote_mail_restore/mail_outgoing_restore