Having an issue with sending e-mails via imap on an SBS 2008 server. I can login to the account just fine (using outlook 2k7).
I get the following error message when trying to send: "send error 421 4.3.2 service not available closing transmission channel"
Outlook web access and exchange outlook clients work fine. Imap was working fine 2 or so weeks ago.
Have tried restarting services, etc.