(07-07-2016, 02:58 AM)TGates Wrote: Due to the fact that we do not know exactly what you changed, maybe this post can help you: https://talk.plesk.com/threads/email-err...ed.306524/
There are a couple solutions to try
Just in case that doesn't help, you are not alone: Google: roundcube smtp error (250) authentication failed
a lot of people have gotten this issue.
Hi TGates
As you send these links i check and found that all those are on plesk as i told i dont know much about the linux operations and i have centos 7 with sentora. So please if you can help please do