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There are just custom certificates setup.The rest is standard with the relay domains setup and the relay host setup on the local mail server. I will try to debug when there is less traffic on the server and i get a fresh issue.

Is there a debuging loglevel i can enable for further testing?

If there was any miss-configuration then all emails should be sent to internal server,since there is no per domain rules setup. There are no smart hosts and no transports are needed. And this only happens with bounced messaged,greylisted or with other issues.

This issue only shows up for bounced/greylisted messages.All other traffic is fine.

This is where i am stuck. I should not relay to localmailserver a bounced message.

Mistake in the sanitation of the log,i have edited to correct.

Example of log: Sep 12 12:09:13 mail7 postfix/smtpd[998464]: connect from unknown[localMailServer] Sep 12 12:09:13 mail7 postfix/smtpd[998464]: A1AD7120EF9: client=unknown[localMailServer] Sep 12 12:09:13 mail7 postfix/cleanup[999848]: A1AD7120EF9...

But should the greylisted messages return to the server or should PMG retry to send after a while?

PMG is not doing the greylisting,the other server is.And when PMG forwards the greylisted message back to the mail server it refuses the greylisted message with "Relay access denied;",but if i do not use PMG as a relay host then the issue dose not appear.

If i add the "gfitest.com" domain to the relay_domains parameter in main.cf then the bounced messages are no longer getting relay access denied. How can i accept for relay bounced messages matching the addreses/domains of sent messages?

"Is the mail server same network segment with PMG?" Yes it is and the network segment is in the trusted networks. And in the mail server pmg is in mynetworks and via telnet i can send relay messages,but the bounced messages that pmg forwards to the mail server get reject: RCPT from pmg.local...

When a user example@local.com sends an email to an address that defers the email(greylist) gfitest@gfitest.com the PMG sends the bounce back to the email server but the email server blocks the bounce: NOQUEUE: reject: RCPT from pmg.local[<local ip>]: 554 5.7.1 <gfitest@gfitest.com>: Relay...

Not original poster so i cannot.

It did work,thank you!

How did you save postfix config with smtp_fallback_relay option. After every reboot the setting is missing from the config.