Only 1 post office not sending mail out

[santexia]

I sent the day trying to understand what went wrong with one of my post offices. It stopped delivering mail to all external SMTP servers I tested all the other post offices amd mail is working fine. This post office has 9 domain aliases and the domain resolves publically. the logs show that the message was delivered to the remote smtp see below yet nothing is received on the other end. This is our main domain and clients have been complaining about not getting their mails

09/08/23 05:19:54 SMTP-IN AB5DC515DACA4C8A91609C978B7DB2B1.MAI 2032 10.10.20.235 EHLO EHLO mail.sample.com 250-mail.sample.com [10.10.20.235], this server offers 8 extensions 272 25
09/08/23 05:19:54 SMTP-OU 961C43658DBC448CAF69B3EBC393A7EA.MAI 1880 10.10.20.215 EHLO EHLO mail.sample.com 250-mail.xxxx.com [10.10.20.235], this server offers 8 extensions 25 229 #Ticket#34129: Confirmation de votre demande- Test 2
09/08/23 05:19:54 SMTP-IN AB5DC515DACA4C8A91609C978B7DB2B1.MAI 2032 10.10.20.235 MAIL MAIL FROM:<devis@sample.com> SIZE=13156 250 Requested mail action okay, completed 43 36
09/08/23 05:19:54 SMTP-OU 961C43658DBC448CAF69B3EBC393A7EA.MAI 1880 10.10.20.215 MAIL MAIL FROM:<devis@xxx.com> SIZE=13156 250 Requested mail action okay, completed 36 43 #Ticket#34129: Confirmation de votre demande- Test 2
09/08/23 05:19:54 SMTP-IN AB5DC515DACA4C8A91609C978B7DB2B1.MAI 2032 10.10.20.235 RCPT RCPT TO:<sample@gmail.com> 250 Requested mail action okay, completed 43 30
09/08/23 05:19:54 SMTP-OU 961C43658DBC448CAF69B3EBC393A7EA.MAI 1880 10.10.20.215 RCPT RCPT TO:<sample@gmail.com> 250 Requested mail action okay, completed 30 43 #Ticket#34129: Confirmation de votre demande- Test 2
09/08/23 05:19:54 SMTP-IN AB5DC515DACA4C8A91609C978B7DB2B1.MAI 2032 10.10.20.235 DATA DATA 354 Start mail input; end with <CRLF>.<CRLF> 46 6
09/08/23 05:19:54 SMTP-OU 961C43658DBC448CAF69B3EBC393A7EA.MAI 1880 10.10.20.215 DATA DATA 354 Start mail input; end with <CRLF>.<CRLF> 6 46 #Ticket#34129: Confirmation de votre demande- Test 2
09/08/23 05:19:54 SMTP-IN AB5DC515DACA4C8A91609C978B7DB2B1.MAI 2032 10.10.20.235 DATE 250 Requested mail action okay, completed 43 13159
09/0

[Admin]

The logs are showing that your outbound email is not being sent to Gmail, but to the inbound SMTP on the same server. Check the SMTP Debug log for details - it looks like you are smarthosting the outbound for that domain back to itself. This is set under the postoffice bindings. If you right click on the localhost icon in the admin program, select Properties from the popup menu, then check the binding settings, since each for an IP address has option to forward all the outbound email to a specific IP.