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Whenever I start sendmail service, it reports

May 01 00:51:43 systemd[1]: Starting LSB: powerful, efficient, and scalable Mail Transport Agent...
May 01 00:51:43 su[6784]: (to smmsp) root on none
May 01 00:51:43 su[6784]: pam_unix(su:session): session opened for user smmsp by (uid=0)
May 01 00:51:43 su[6784]: pam_unix(su:session): session closed for user smmsp
May 01 00:51:43 sm-mta[6807]: starting daemon (8.15.2): SMTP+queueing@00:10:00
May 01 00:51:45 sendmail[6733]: Starting Mail Transport Agent (MTA): sendmail.
May 01 00:51:45 systemd[1]: Started LSB: powerful, efficient, and scalable Mail Transport Agent.

but after ca. 15-20 seconds I get

May 01 00:52:01 systemd[1]: Stopping LSB: powerful, efficient, and scalable Mail Transport Agent...

I've never encountered this timeout before, and due to it I can't send e-mails using wp_mail() function. Using sendmail in CLI sends E-Mail as intended - but the issue is mostly about wp_mail().

Is there any workaround or way to make sendmail "persistent"?

Screenshot of systemctl status sendmail output

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