All of a sudden, outgoing messages on a gmail account linked via IMAP to Mail.app are not going out. I get a smtp server can't be contacted (paraphrasing) error. Incoming mail works fine. The whole process worked great for several weeks and then stopped. I deleted the account from mail.app and readded it - it worked for a couple sent mails and then started failing again. It causes an annoying pop-up because it keeps trying to resend the message every so often, and fails because the smtp server can't be contacted. Other computers on my network synced to other gmail accounts are working fine. I am really stumped! Help!