If you unable to send an email from Exim server, you need to check in Exim main error log, it’s generated below errors.
tail -f /var/log/exim_mainlog
2014-07-08 14:36:38 [16059] courier_login authenticator failed for (domain.com) [192.168.0.21]:47845 I=[192.168.0.20]:25: 535 Incorrect authentication data (set_id=support@newdomain.com)
It occurs may updated your cPanel in your server, cause there are few new functions updated for Exim Mail. They have added the function which rejected mail authentication.
Solution 1:
Open the exim.conf.local file and update,
vim /etc/exim.conf.local
MAIN_TLS_ENABLE = true
MAIN_TLS_ENABLE = true
or
/etc/exim4/exim4.conf.localmacros
Solution 2:
Login to WHM panel , Main >> Server Configuration >> Tweak Settings >>
Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak) :
Make above function Set to : OFF
I hope you have fixed this error permanently.
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