Greetings, americanninja and welcome to Sentora Forums.
It seems to me you have to setup a more strict Spam Filtering (see "Ubuntu 14.04 | Install and Configure Postfix + Amavisd-new + ClamAV + Spamassassin" ).
From what I can tell Gmail is greylisting you due to the amount of spam you sent to Gmail, probably on your previsous Cpanel Setup you had strict spam rules (honestly Sentora defaults are not optimal to filter spam).
On the most basic level you can try to enable the RBL filtering (I do not recommend using this without testing because it can cause a lot of false positives) you can see a list of some RBL's on Wikipedia, remember that using RBL's you need to keep checking if they are being updated or not, the default "SpamHaus" is a safe one to use (still with false positives).
After you reduce the amount of Spam sent to Gmail servers you should be removed from the greylisting with time...
Note: I hope I understood your problem correctly, if not please tell me
It seems to me you have to setup a more strict Spam Filtering (see "Ubuntu 14.04 | Install and Configure Postfix + Amavisd-new + ClamAV + Spamassassin" ).
From what I can tell Gmail is greylisting you due to the amount of spam you sent to Gmail, probably on your previsous Cpanel Setup you had strict spam rules (honestly Sentora defaults are not optimal to filter spam).
On the most basic level you can try to enable the RBL filtering (I do not recommend using this without testing because it can cause a lot of false positives) you can see a list of some RBL's on Wikipedia, remember that using RBL's you need to keep checking if they are being updated or not, the default "SpamHaus" is a safe one to use (still with false positives).
After you reduce the amount of Spam sent to Gmail servers you should be removed from the greylisting with time...
Note: I hope I understood your problem correctly, if not please tell me
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[Module] Mail Quota Count | Vagrant Box with Sentora
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