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Thankx for your fast reply and help. I am now reviewing your suggestion. Is correct (172.16.5.233) this an internal SMTP server

Hello, thanks for your comment. This error is shown by the log of my Relay server, it accepts the message, but it bounces for that reason. It happens with only one users of the sender domain, all the other senders of that domain enter their mail perfectly. That's why I want to know what the...

Hi, i have similar issue here, how to fixed status=bounced (host 172.16.5.233[172.16.5.233] said: 554 Message is not RFC compliant (in reply to end of DATA command) ? Mar 14 13:08:58 mail postfix/smtpd[1501]: connect from defnsv1599.mtu-friedrichshafen.com[46.235.193.40] Mar 14 13:09:00 mail...