Hi All, since Tuesday I have a strange problem. Mail from *.outbound.protection.outlook.* (Office 365 users) is connecting and disconnecti but does not deliver email. Sending from other domains like gmail.*. icloud.* are delivered correctly. Does someone has a solution? Dec 19 20:06:32 svr04 postfix/smtpd[2419]: connect from mail-vi1eur03on20706.outbound.protection.outlook.*[2a01:111:f400:fe1b::706] Dec 19 20:06:32 svr04 postfix/smtpd[2419]: disconnect from mail-vi1eur03on20706.outbound.protection.outlook.*[2a01:111:f400:fe1b::706] ehlo=1 starttls=1 quit=1 commands=3 Config: Ubuntu 20.04 TLS Postfix Dovecot Just a normal ISPConfig3 installation. Kind regards, Johan
is this a recent setup that uses Rspamd as mail filter? if yes, log in to the Rspamd interface, maybe it shows you additional details. Might be that rspamd is greylisting this sender domain and if outlook tries to re-deliver from different domains, it will not succeed.
Hi Till, Thanks for your fast reply. I'm running this setup since June/July Amavis, clamav Regards, Johan