Quote:
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Mar 19 15:24:42 serverA postfix/smtp[4026]: 35B071EA0AB7: to=<email@serverB.com>, relay=none, delay=0.14, delays=0.04/0/0.09/0, dsn=5.4.6, status=bounced (mail for serverB.com loops back to myself)
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Do A and MX records for serverA.com and serverB.com point to the same hosts/IPs, or are they different?
Have you tried inserting records for serverA.com and serverB.com in each server's /etc/hosts file (you can use their local IP addresses in that file)?