One of my end users says that they didn't receive an important email yesterday.
I have the copy of the email that he was supposed to receive yesterday that says it was sent but he said he didn't get it.
How can I check to see if an email was actually not delivered vs. being caught in a spam filter? We don't have an external spam filter (such as Barracuda) so it isn't sitting in anything like that waiting to be delivered.
Thanks in advance.