I can receive email but I cannot send it. The error message is "Unable to connect to the outgoing mail server (SMTP).". It worked fine several days ago and I don't remember changing any of the settings. Does the SMTP server require authentication?
Don't even go down this road......IMAP doesn't work right now. You need to set up a POP3 account(make it a dummy account) then do a send receive and then you will be able to send mail from your IMAP account.