"Mail cannot be sent" error

H

HSS66

Version: 2008 Operating System: Mac OS X 10.5 (Leopard) Processor: Power PC Email Client: imap Everything has run fine since release of the sw but not when I try to send an email I get an error that the computer is not connected to a network--which is untrue since I'm on DSL, and all other internet applications function as normal.

Any ideas?
 
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