Can't send mail with IMAP

Hi,
I have two different IMAP accounts, and I can't send mail with either of them. I receive it just fine, but can't send. One of them just switched to ESMTP (I'm not entirely sure what that means), and said that many mail programs are not yet compatible with it. I know that both accounts can send, as I can send from them on the web.
I have tried switching from port 25 to port 587, with no luck. Regardless of what I do, the program displays a window saying, "Sending the message content to the server failed." I haven't been able to send for a little over a week now. Any help would be greatly appreciated.
Thanks

Tonight I have been suddenly unable to send e-mail from my mac.com address.
The problem is the same whether I try to send from my G4 laptop running OS 10.4, or my eMac running OS 10.3.9 , or from .mac web mail.
The alert I am receiving says: "The sender address [email protected] was rejected by the server."
I am using the SMTP outgoing mail server, not POP.
I can still receive e-mail with no difficulty.
I have changed no settings.
What's up?

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