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Topic: Postfix email error : reject: END-OF-MESSAGE from unknown[]:451 4.3.5

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Hi,

I am getting following error in maillog. There 10-15% mails are rejected with following errors. I checked main.cf file did not find any issue. I am not sure if this is related to resource or performance issue.

S/w : iRedMail-0.8.6
DB : iRedAdmin-Pro-MySQL-1.8.1
Linux

Error :
-------
Mar 21 03:55:49 <mail host> postfix/smtpd[13197]: 7E9C2947629: reject: END-OF-MESSAGE from unknown[ ]: 451 4.3.5 Server configurati
on problem; from=<> to=<> proto=ESMTP helo=<>

Please let me know if you need more info.

Thanks
Manish

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2

Re: Postfix email error : reject: END-OF-MESSAGE from unknown[]:451 4.3.5

*) Is policyd or cluebringer service running?
*) Is iredapd service running?