I've been back and forth between using and not using PMG at my organization, the thing that's causing me the most snags is greylisting.
In short, we receive a lot of necessary for production, automated email, that is coming from a randomly generated domain for every message (on an unknown / different every time cellular network block), and the sending server software cannot be configured to reattempt redelivery. This probably accounts for 90% of my mail traffic.
Greylisting seems to catch all of this though, I hadn't heard of greylisting before using PMG, and it seems to be doing its job.
Can I make it *not* do its job? The only setting I've found on my own are the "Use Greylisting for IPv4" and "Use Greylisting for IPv6" on the Mail Proxy > Options setting screen, both of them are unchecked, but according to Administration > Tracking Center page, nearly all of my mail is greylisted.
Is there another "Greylisting = On / Off" setting that I'm missing somewhere?
In short, we receive a lot of necessary for production, automated email, that is coming from a randomly generated domain for every message (on an unknown / different every time cellular network block), and the sending server software cannot be configured to reattempt redelivery. This probably accounts for 90% of my mail traffic.
Greylisting seems to catch all of this though, I hadn't heard of greylisting before using PMG, and it seems to be doing its job.
Can I make it *not* do its job? The only setting I've found on my own are the "Use Greylisting for IPv4" and "Use Greylisting for IPv6" on the Mail Proxy > Options setting screen, both of them are unchecked, but according to Administration > Tracking Center page, nearly all of my mail is greylisted.
Is there another "Greylisting = On / Off" setting that I'm missing somewhere?