Answer by Jacob Evans for Gmail accepting postfix relay via Port 25 but...
Sounds like you are authenticating on port 25, this assumes you are connecting as another server and thus originating emails from those device's IP Addresses.Re-configure your endpoints to use SMTPS...
View ArticleGmail accepting postfix relay via Port 25 but rejecting emails sent via TLS...
I have a postfix email server that handles mail via two routes. First is a relay on port 25, this is dedicated to a single external IP address via a 'mynetworks' entry. This route is to handle email...
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