Strange thunderbird sending problem... [solved]

[Duncan Lithgow]

Tony Nelson wrote:

>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.
>____________________________________________________________________
>TonyN.:'                       <mailto:tonynelson at georgeanelson.com>
>      '                              <http://www.georgeanelson.com/>
>
>  
>
I've found the problem. Oddly enough it's one of the addresses in the 
email I tried to send. Why it didn't just send them all out and let me 
collect the bounced failures I don't know... I've spoken to the guy with 
the address and got a valid address from him.

Still, odd problem.