[Grim]

Like I said, I had the exact same problem. Could receive, but could not send. To change the port setting go :

tools >
accounts >
edit >
advanced settings > (or "select advanced settings")
Change the port setting to 110

Or first check the port setting on your husband's email and use that one. This should solve the problem.

[Anitius Severinus Boethius]

Port 110 is standard for POP, port 25 is standard for SMTP. If the problem is outgoing, SMTP is the culprit.