Can't send emails from my server.
Hello, I'm on Ubuntu 12.04 X64 on 1GB Ram Droplet also I've Zpanel as CP.
Some emails are failling to be delivered.
I always get same messages for same sent email domains:
"Undelivered Mail Returned to Sender" and "Delayed Mail (still being retried)"
I made some pastebin for both messages. Here:
http://pastebin.com/sv8bdpQg and http://pastebin.com/5AeCFNRj
I don't know how to fix it.