I didn’t mean pop, I meant smpt. I think. 
What happened is that outgoing mail always went through my server.
Suddenly today no mail would go out except the one address I had through my ISP account. I fiddled around and finally asked the ISP.
They say they don’t know how I was ever able to send any mail. All outgoing mail goes through them if I use them as ISP.
This bothers me because then they can read all the mail, can’t they?
Can I avoid that?
I don’t send newsletters or anything that way, I just am suspicious nowadays of anyone suddenly requiring access to my mail content.
I guess I am just paranoid?