New Email Can't Reach My Pop3 Server

I didn't get any new emails today. That's most unusual.

I use W7.

There were 4 emails that I hadn't deleted, and those came through.

Anything else has been blocked.

I tried to forward an email from my Yahoo account to my POP3 account.

It didn't arrive.

Then I composed an email to my POP3 account from Yahoo mail.

It didn't arrive.

That means the connection is fine, but something is blocking ALL new mail that comes to that account, and keeps it from going into the server.

Maybe malware could do this, but I suspect it's a hack. I've been hacked before, but this is the first one I can't get around.

The blockage is occurring before new email reaches my server. All my server can give me is what is already there.

What can I do?

 

What you can do is what was requested of you a week ago in your Specialist Malware Forum thread - carry out the steps in the Read & Run Me First Guide and then post the scan logs required in that thread (NOT here in this one).
Unless you do that, you are not helping us to help you.