A spammer is sending mail to Polish addresses faking an address from one of the domains I administer.
Nothing unusual in that. What’s more annoying is all the recipient postmasters replying to the APPARENT from-address, ie my address, saying the mail is spam.
At least one of them is smart enough to acknowledge :
The message carried your return address, so it was either a genuine mail
from you, or a sender address was faked and your e-mail address abused
by third party, in which case we apologize for undesired notification.
What’s more, some will even provide a trace to the sender IP address, often in .cn, .kz, .ir, etc.
But if they know that why spam me with bounces? Really, guys, think a bit further.