Il 22/05/21 23:52, Mark Sapiro ha scritto:
It's probably not blacklisting. It's not getting that far. Your
glugctis attempting to connect to port 25 at mail.simail.it and the connect is not being answered. Normal blacklisting will not occur until after the remote MTA answers the connect and determines the IP of the caller. And in any case, if it is some kind of blacklisting it is yourglugctserver that is blacklisted by mail.simail.it.I just did the following
$ telnet mail.simail.it 25 Trying 217.27.113.30... Connected to mail.simail.it. Escape character is '^]'. 220 mail.simail.it ESMTP ready. quit 221 mail.simail.it closing connection Connection closed by foreign host.so it did answer my connect. In any case, this is not a Mailman issue. It is between Postfix on your server and the remote server at mail.simail.it. Thanks Mark for the reply, I had already checked with the telnet command on port 25 and everything is fine. The suspicion of the blacklist came to me, but now, after checking https://mxtoolbox.com/blacklists.aspx I saw that the mail.simail.it server is in the SORBS SPAM blacklist. Because my lists work fine on any other mailing address. I also checked my email server reputation at https://www.mail-tester.com and I get 10/10 Apparently it doesn't depend on my postfix server.
In this case, what strategy do you recommend?
Thank you
-- blackout69