Greylisting and iPhone email account setup....

Hopefully I am not duplicating an already existing topic.

I notice that my users cannot get thru the verifying stage when setting up a new email account on their iPhones if greylisting is turned on. They will enter their information and then it will stay on the verifying popup for about 10 minutes until it pops up.

If I turn off greylisting, the issue goes away.

I doubt there will be a fix for this, but am curious if anyone else has seen this issue.