Can't Send email

Hi all,
Recently developed problem with Apple mail. I can get mail but can't send mail - I get this error message.
ERROR
This message could not be delivered and will remain in your Outbox until it can be delivered.
The attempt to read data from the server “smtp.comtekmail.com” failed.
I've reloaded the operating system, double checked all the acount settings. I have a laptop running 10.4 and have no trouble with the mail.
Suggstions welcome.
iMac Mac OS X (10.3.9)

Hi sundance2548.
I don’t really know what’s going on here, but...
Mail Help has some articles devoted to sending problems, e.g. “I can't send email” or “I can't send email because the connection to the server on port 25 timed out”. You may want to take a look at them in case there is something there that applies to you.
Something that usually works if you’re trying to use an outgoing (SMTP) server different from the one provided by your ISP (and in the case of .Mac in particular) is changing the outgoing server port to 587 instead of 25 in Preferences > Accounts > Account Information > Outgoing Server Settings.
On the other hand, if the outgoing server that doesn’t work is the one provided by your ISP, the problem could be that you’re telling Mail to authenticate, but the outgoing server doesn’t actually require authentication because it can determine who you are by other means.

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http://support.apple.com/kb/TS3899
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http://ipadhelp.com/ipad-help/ipad-cant-send-emails-troubleshooting-steps/
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Can't Send email

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