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Postfix + PHP Mailer - Change User

You can change this in php.ini on a global scale. Just look for the commented section about email.

I've had some success in changing if for individual domains using vhost.conf with mod_php but it should deflinitely work using the php settings tab when using php in fastcgi mode.
 
Hmm, no that didn't work.
It changed it in php info but the CreLoaded mailer ignored it.
I think it must be this CRELoaded "sendmail" setup.
I will look it to it some more over the weekend.
 
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