Mail stays in Queue

[Peter_Hartmann]

I am relatively new in Plesk and have some problems with mail not being sent properly.
On the server, there is installed a WordPress installation. Mail from this WordPress installation never reaches for example suscribers. Almost all mail remains in the Queue and will be deleted after 7 days. Could it be because I do not have an SSL Certificate? Hope you can help.

I use:

Plesk 11.5
CentOS 6.6
postfix

 

[UFHH01]

Hi Peter_Hartmann,

please use your former thread, which seems to be the exact same issue/problem: https://talk.plesk.com/threads/mail-stayes.331022