More detail:
Somebody is sending emails
to this address, but using
your email address as the 'return' address. This is a common tactic used by spammers, or by people attempting to create a denial of service condition on the associated mail servers.
There is (theoretically) little that you can do about it, other than to route all emails from that domain (assuming you have no legitimate contacts there) directly to your junk mail folder.
I had a concerted attack against one of my domains last year. At the peak of it I was receiving thousands of these 'bounced' emails per hours, all of them from different domains throughout the world, In the end I had to just tell the mail server to drop
all incoming mail traffic until such time as the attack stopped.
That was a fun time
