Technical Details of permanent failure
Unspecified Error (Sent_message): Connection timed out
Above error always happens when sending to our domain but not to all. it only applies to some of the senders.
Senders are normally some gmail, yahoo or hotmail users.
it has been a week.
we are using sms for smtp 5.0.1 and using exchange 2003 sp2
anyone can help?
I tried to white list the sender also they got the same error.
connection timed out.