Unfortunately, it has resulted in new errors in the Postfix maillog cause all incoming emails to be discarded at key points, primarily forwarding to other servers such as gmail for Inbox.
Based on these new errors, I suspect one key difference is that the source IP is being mangled, so that Postfix sees it as coming from the router instead of the external sender. Is there a way to configure how forward-port mangles the source IP and other parameters in forwarding? I could find very little documentation online on forwarding options and issues, with options being very limited.
In postfix, these are the new errors that didn't show up before, with last one resulting in the email being discarded:
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Apr 26 20:57:21 serverhostname postfix/smtp: warning: host mta5.am0.yahoodns.net[18.104.22.168]:25 greeted me with my own hostname mail.mydomain.net Apr 26 20:57:21 serverhostname postfix/smtp: warning: host mta5.am0.yahoodns.net[22.214.171.124]:25 replied to HELO/EHLO with my own hostname mail.mydomain.net Apr 26 20:57:21 serverhostname postfix/smtp: 687D81E68137: to=<firstname.lastname@example.org>, orig_to=<email@example.com>, relay=mta5.am0.yahoodns.net[126.96.36.199]:25, delay=30, delays=0/0/30/0, dsn=5.4.6, status=bounced (mail for yahoo.com loops back to myself)