Outgoing Mail stops working

My parents have an iMac with 10.3 and have a pop account with PraireWave. Mail has worked fine for over 1 year. Recently a problem has developed where new mail will not send. Restarting the machine solves the problem.
Any ideas?

Bryan,
Welcome to the Discussions.
Is it possible that PraireWare has changed the name or authentication for the SMTP used as Outgoing Server? Many ISP are making changes in this regard, as they fight SPAM. Sometimes the old method is honored, for a time, and may be inconsistent during the transition period to the new SMTP or new authentication requirement.
More info, please.
Ernie

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