I am in the middle of adding the Exchange Online Protection IPs myself right now. It appears that there are close to 400,000 IP addresses in about 27 different CDIR ranges. After that I need to track down the Google IPs. Then possibly Yahoo and AOL, etc.
This brings up two points:
1) this should have been a prepopulation option from SmarterTools. I should at least have the ability to say, for example, allow Exchange Online Protection somewhere and not have to track all this down and enter it manually as this completely breaks Greylisting. How long do you think it will take for the mail server to pass a message when it could come from 400,000 different IPs? Longer than 4 days I would suspect.
2) Once you have added exceptions for all the big providers, where has the value of Greylisting gone? Practically into the toilet. You have now excluded the vast majority of locations you will receive mail from.
This needs to be rewritten as this seems to be a very poor implementation, and it is not described by SmarterTools as working in this way. It is described as being done via the From: address, so that is how it should work. Don't say one thing and do another.
Just my two cents.
|John C. Reid / Technology Director|
John@prime42.net / (530) 691-0042
1300 West Street, Suite 206, Redding, CA 96001