I've posted in the Slingshot forum. My trouble was that I haven't been able to send email via gmail or hotmail smtp servers using Apple Mail 4.4 for the last week or so. Mail was working fine up until last week.
If I go into my gmail or hotmail accounts via Firefox, there is no issue with sending.
I've done several things and worked out what is happening. If I don't send an email for a while (say 5 minutes), all smtp servers go offline and won't come back online automatically. If I open the Connection Doctor, it logs into the accounts. Then I can send emails. Damned annoying and there must be some fix.
Anyone know of a way to delay, or stop, smtp servers from going offline through inactivity?