I did some work with an organization and had a falling out, so I left them. They used postfix to have email@example.com, and I had one. I set up gmail to get my mail via POP as well as to "send mail as @_.com". I think for a long time they forgot to delete my email address and now it seems that I can send but not receive mail at the address. What could a possible explanation for this be? Can they revoke delivery but not sending from the address? Why would they only revoke one if they cna revoke both? Is it more tedious or difficult a task to revoke sending?