Unable to send emails on a Plesk server via WordPress, PHP script, or webmail. The following records appear in the
sendmail: handlers_stderr: ERROR:__main__:Rejecting message: system user uid='10000' is not allowed to send mail#012DATA REPLY:554:5.7.0 Your message could not be sent. The user johndoe is not allowed to send email.#012REJECT
May 18 10:37:46 localhost journal: plesk sendmail: REJECT during call 'limit-out' handler
Previously, the subscription was created on service plan with disabled mail service and then switched to another plan with enabled mail service.
#PPP-52477 "The plesk repair mail <domain|mail-address> command now repairs the Outgoing Mail Control subsystem more reliably."
- Plesk Obsidian 13 October 2021 (Linux)
Please consider updating your server so the newly created subscriptions are not affected.
For the already affected subscriptions, perform the following: