But when I enter my postfix admin mailid, and password (i am 100% sure these are correct), it goes to a page domain/login.php and then says "Page not found".
Just like there is an option to set base url in htaccess for rewrites in Drupal there must be a way to tell postfix admin that it is not installed at the root and that it should redirect to domain/mailadmin/login.php and not domain/login.php. Could be something in .htaccess for postfixadmin like Earnie mentioned or it could be in config.inc.php for postfixadmin
You could walk through a few installation instructions on postfixadmin and see if you have missed any of the steps.
Thanks Anoop
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