Have you checked the postfix.conf file? There's an aggressive mode in there as well. You might have to post some failed login attempts and test with fail2ban-regex.
Have you seen the blocklist suggestion at https://superuser.com/a/1168969/691755 Hello, > > I'm getting a lot of postfix postscreen failed authentication atempts. > I'd like to use fail2ban to block these, does anyone have a > configuration for this? > > Thanks. > Dave >
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