I have a mail server that for the last two days has been getting the error:
Client Session Could Not Connect To 'mail server name'
Outgoing mails are all failing to send. There is no reason.
My mailserver is not blacklisted. It has a good rating.
My firewall has not had any changes to port 25. Everything for that box and that port is the same. I have made no changes to the mail server at all. In fact, I even tried a recovery to last month's backup of the mail server, just in case.
I run a test within the mail server and it sends me a test message fine, and everything passes.
I can't imagine why it is failing. All my sites are working, my internet is working, etc., so I know my firewall isn't broken.
Any ideas? It has been failing to send for two days.
The only thing done two days ago was adding another server to the network. I shut it down. Still mail doesn't send.
I had added settings for it to the firewall, but none to do with the mail server box. I even deleted all those settings and still won't send.
I have rebooted. I have reset the server. I have searched google. I have reset the mail server confg from last month's backup in case it got corrupted. I have removed new settings I added to the firewall.
I now have 9000 mails in my outgoing retry queue. Please help.