Zimbra Error 450 4.7.1 sender reject as below
Feb 10 16:16:33 sd-15xxx postfix/smtpd[1832]: NOQUEUE: reject: RCPT from
unknown[x.x.x.x]: 450 4.7.1 Client host rejected: cannot find your hostname,
[x.x.x.x]; from=<[email protected]> to=<[email protected]>
proto=ESMTP helo=<smtp_sender.com>
You can check step by step to solve problem as error above
Step 1: Check smtpd_sender_restrictions on zimbra MTA.
[[email protected]_mta ~]$ postconf | grep "smtpd_sender_restrictions"
Checking reject_unknown_sender_domain,reject_unknown_client_hostname,reject_invalid_helo_hostname is correct your environment
Step 2: Check server port 10031 on zimbra cbpolicy.
tailf /opt/zimbra/log/cbpolicy.log
To check the database have lock? sometime due to cbpolicy.
You can solve problem anything else? share your error Zimbra Error 450 4.7.1 sender reject comment below
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