braindead0 wrote:
Many mail hosting companies block at the insertion point based on block lists, reverse dns and a variety of other techniques. I would suspect that an SPF check failed and kicked the mail back to KOA without ever hitting your friends email account.
It's still on KOA if that's the case, the email would have bounced back to the sender.. and I'd bet they send from an unmonitored account so the kicked mail (probably a lot of them now) just sits there.
Incompetence at best.
That is not always the case. I went around in circles with comcast because it was happening to me but we were not getting the bounces.