Check with the user before denying any of their email
I'm not receiving legitimate email. I have a service that tracks horses I wish to wager on and sends me an email when they are due to run. For no reason at all these emails have been cut off. The sender tells me they are sending them so the problem must be you aren't delivering them. I get plenty of spam that makes it thru yet you fail to deliver legitimate email. FYI the sender is Stablealert@horseracinginfo.com
Lori Rutt commented
I am having a similar issue, and so is my mother. The issue is with Yahoo, and I wish they would fix it!