On Sun 30 Aug 2009 09:18:09 AM CEST, Ivan S wrote

> In my office we are using SM for external user to connect to our  
> exchange server. we're using squirrelmail 1.4.9a and postfix-2.3.4.  
> we are having issue these few days where spammer can send email  
> through this webmail using other domain to send to internet. below  
> is the log from maillog:

this is not squirrelmail problem, its postfix that is configured  
badly, post postconf -n on postfix maillist

your mta accepts forged senders in relay

-- 
xpoint


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