Patrick Proniewski: > Hello, > > I've got a strange problem with my MX server, that is not related to postfix: > looks like neither Steam nor Binance can post email to me. I've had a > discussion with Steam support, they said they have delivery failure on their > side but couldn't provide more details than this: > > Time Attempted: 2021-01-23 08:20:59 > Address: *@patpro.net > Remote MTA Status: 597 > > I see nothing in my postfix logs, I see nothing in my firewall logs. Inbound > connections from Steam server is visible in my logs until the 22th of > November 2020. Since then, nothing. > > I'm looking for a tool/service that would help me diagnose delivery problems > to my server? Any hint appreciated. >
What about good old telnet or netcat? wzv$ telnet mail.patpro.net smtp Trying 193.30.227.216... Connected to mail.patpro.net. Escape character is '^]'. 220-Do not say anything yet Here is a pointer: https://tools.ietf.org/html/rfc2821#section-4.3.1 Note: all the greeting-type replies have the official name (the fully-qualified primary domain name) of the server host as the first word following the reply code. Sometimes the host will have no meaningful name. See 4.1.3 for a discussion of alternatives in these situations. Wietse
