Need help with another mail server. This one is running Citadel. It has suddenly stopped sending mail and stopped receiving mail, although it will occasionally receive it. This client uses the server to allow a small number of employees to send/receive mail around the country (they each live in a different state) and while the owner uses the web client - Citadel - the employees mostly use Outlook.
The server isn't having any problems with being banned (as far as I know). It just stopped working correctly earlier this week. It is very possible that someone went in and messed with the settings.