Strange thunderbird sending problem...

[Tony Nelson]

At 7:31 PM +0200 8/11/05, Duncan Lithgow wrote:
>I've started getting this error in thunderbird, I thought I'd ask if
>anyone has seen this before...
>
>"An error occured while sending mail. The mail server responded: unknown
>user. Please verify that your email address is correct in your Mail
>preferences and try again."
>
>It only happend sometimes and I'm not sure what the pattern is. Anyone
>have an idea, and no it's not my Mail preference - it works fine most of
>the time.
>
>SElinux is disabled, and setting smtp as a trusted service didn't help
>(i've set it back again)

I expect that you aren't sending through your own SMTP server, but through
a server provided by your ISP or MSP.  This might be an authentication
issue with them.  In my case, I'm using (the default) POP before SMTP hack,
where if I've checked mail "recently", I'm allowed to send mail.  If I
haven't checked mail "recently" I get a scary error message that I'm
unknown.

If you are using some more sophisticated authentication, such as SMTP AUTH,
this probably isn't your problem.
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