Can't Send email from Mail or Entourage

I tried posting this last night, but it doesn't seem to be showing up anywhere. Just last week my computer stopped sending mail. I can receive fine, but not send. I have tried in Entourage and in Mail. I'm using a POP account and use a different server for incoming and outcoming.
It worked fine until last week and the same thing works fine at my work (using the outgoing server from my work and using my home ISP at work) I use my ISP outgoing server at home and have even tried using a trial for MSN, and my work ISP to see if another ISP would do it but it doesn't.
It comes back in Eudora with an error message: "Mail could not be sent using the account "Brian". A connection error occured. Error -3260. Mail says The message could not be appended to the Outbox.
I've tried changing from port 25 as well. I also tried setting up a new user account and starting Mail up new and fresh with the same results. My wife sent something at 9:00 and 1 hour later the problem started, so nothing was installed new at that time. Just upgraded to 10.4.4 today to see if it would help.
iMac Mac OS X (10.4.4)
iMac Mac OS X (10.4.4)

I'm not sure how you come to this conclusion. If you
can send mail with any email account and SMTP server
when connected to the internet at work but not when
connected to one of two personal ISPs when connected
to the internet at home, how can this be a computer
or Mail.app problem?
Because I have a different computer at home than the one I have at work. Were you thinking it was the same computer?
If this is a computer or Mail.app problem, don't you
think you would also have problems sending mail when
connected to the internet at work?
Not if the computer at work isn't broken like I assume the computer at home is.
Do you have dial-up internet access at home for both
ISPs?
Both ISPs are dial-up. One is All2Easy (This is the ISP I used first) and one is MSN. A new development is that I can no longer dial up using All2Easy. I get online using MSN. I can still send mail from work using the outgoing mail server of email.all2easy.net though.

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