It’s called a Joe Job apparently, and I have also been a victim quite a few times.
If you are unlucky, your domain could end up on an ISP blacklist, as I suspect mine has at some point, as some people on a mailing list I am on no longer see any of my emails.
Hope it clears up for you soon.
Implement SPF in DNS and this won’t be as much of a problem.
Bendit: Thanks for pointing us to SPF. I have found OpenSPF. Is this a good place to start?
Will help you begin the process. Once done it will show you example of how to update you DNS reocrds. Does not require software install on your servers or anything else.
I should note that SPF does not fix everything.
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