Question Mailman smtp-failure

[moswak]

Hi,

centos 7.4
Plesk 17.5 latest Updates
mailman
greylisting

the maillinglists have worked without problems but now Mailman doesnt send Emails.

In Serverwide whitelist i have
127.0.0.1 / 32
::1 / 128

In /var/log/smtp-failure i see

delivery to dggetzet@xyz.de failed with code 451: 4.7.1 Service unavailable - try again later

In /var/log/maillog i see
milter-reject: DATA from localhost[::1]: 451 4.7.1 Service unavailable - try again later; from=<dfsfdsfsdf-bounces@dfdsfs.de> to=<sfsfsf@fsfde> proto=ESMTP helo=<sfsddfsdfsf>

can someone help me ?

 

[Rob Jacob]

i think i have the same problem on my ubuntu 16.04 server

when i deactivate "Switch on server-wide greylisting spam protection" on the email server in plesk panel, it works

log mailman/smtp-failure
delivery to <mailadress> failed with code 451: 4.7.1 Service unavailable - try again later

i am on Plesk Onyx Version 17.5.3 Update #35

any ideas?

thx
rob