I have been having problems with emails from our websites being blocked, particularly via AT&T, I need some help to check my configurations and ensure I am not at fault. I realize I may need to pay for the help but I am not sure where best to get help.
I have been running a Linode VPS with Ubuntu 10.04 LTS for several years, however in Dec last year a Druple website was compromised and started spamming. I traced the compromised files and removed them and ensured that all Druple installations were up to date. As far as I know there has not been any spam since. However I stijll get regular undeliverable email notices from AT&T despite having gone through their unblocking form. Also I have checked every source of blacklists I can find and do not appear to be on any blacklists.
I have tried to ensure all my email setup is configured correctly but my knowledge is limited so I would like to have them checked by a knowledgeable person.