Issue Incoming emails getting rejected

[nisamudeen97]

Aug 21 13:21:17 srv postfix/smtpd[5475]: 93A1E1842D6: milter-reject: DATA from eopbgr1004.outbound.protection.outlook.com[server-IP]: 451 4.7.1 Service unavailable - try again later; from=<sender address> to=<my email account > proto=ESMTP helo=<EUR02-.outbound.protection.outlook.com>


I have turned on spam protection in plesk "server-wide SpamAssassin spam filtering" and "server-wide greylisting spam protection" Why the emails are getting rejected without any proper reason ?

 

[UFHH01]

Hi nisamudeen97,

pls. be informed, that it up to the server administrator, to configure the log - level for the depending service log. If you need a more decent output in a service log, consider to choose a higher level, than the standard defined log - level for that service in the depending configuration file.

451 4.7.1 Service unavailable

This can be an indication of a non - working depending service, or a depending service, blocked by a firewall setting. Consider to restart

/etc/init.d/ctasd_initd restart
/etc/init.d/ctmilter_initd restart
/etc/init.d/pc-remote restart​

... and pls. look out for possible issues in the depending log - file for further investigations and suggestions.

Plesk for Linux services logs and configuration files ( KB - article: 111 283 )​

Often enough, the Plesk repair utility is able to resolve misconfigurations, so pls. consider as well to use the command:

plesk repair mail
​

... to repair issues with your mail - server.


An additional method to repair mail - server issues, is to switch between qmail and postfix and smtp-courier and dovecot. ( NO current eMail will be touched or deleted during this procedure! ):

/usr/local/psa/admin/bin/autoinstaller --select-product-id plesk --select-release-current --install-component qmail
( wait for the procedure to be finished, pls... )
/usr/local/psa/admin/bin/autoinstaller --select-product-id plesk --select-release-current --install-component postfix


/usr/local/psa/admin/bin/autoinstaller --select-product-id plesk --select-release-current --install-component courier
( wait for the procedure to be finished, pls... )
/usr/local/psa/admin/bin/autoinstaller --select-product-id plesk --select-release-current --install-component dovecot​

If you need help with further investigations, pls. consider to post more informations from your mail - log, or/and syslog and consider as well to post the depending configuration file(s) from your used mail - server.