Scam and Phishbusters → Re: Sudden Increase in Spam?

Besides a 25% increase of spam to my domains, a spammer in China & Russia has been spoofing one domain so the catchall account got over 50000 bounced messages.

I am also getting tons of undeliverable receipts from emails I didn't send. Is there anything I can do to stop these or something I should be investigating? It's a catch all email

Nothing you can do except filter those into the "Deleted" category and wait for the storm to end. Spammers used your email as a "Reply To" and "From" location. The responses will dry up after a while.