Dear Colleagues,
I have a problem with my Postfix/Mailman configuration. Basicly everything is working fine except one thing. When I`m sending message to mailman admins: From: u...@example.com To: mailman-ow...@list.example.com Postfix generating SMTP session failure. Jun 23 10:59:25 2017 (18113) SMTP session failure: 501, 5.1.7 Bad sender address syntax, msgid: <CAKPGuG9oNCPVcqH=UZu1SOqFCvTh= qamdwf_azlcskelfoy...@mail.gmail.com> So in this example, I have sent message From: zalezny.niezale...@gmail.com To: mailman-ow...@list.example.com For some reason Postfix is not able to acceppt sender E-mail address " zalezny.niezale...@gmail.com". My Mailman server is behind the firewall, could it be that server is not able to resolve gmail.com domain and thats why rejecting it ? How to solve it ? Cheers Zalezny
