Is my domain being spoofed?
 

I'm getting tons of returned-undeliverable emails for one of my domains which appears to be sending out spam. What can I do about this?

And what the heck does "envelope-to" mean?

I have catch-all set up and just block mail from any domain that I don't use for email

I've seen a huge increase in this the last week. :(

If you get any spam from gothvirgin.com, it's not me... grrrrrrrrrrrrr!!!!!!

envelope-to is used when sending an email to more then one person and you only want that person to see thheir own email address ...

The To: header includes everything in the To: line of the email, as it was originally written by the sender. The Envelope-To: header includes only the single address that a copy of the message is destined for. If mail is sent with a To: line of "[email protected], [email protected]", Then joe gets a copy with an Envelope-to: header of "[email protected]", while jane gets a copy with an Envelope-to: header of "[email protected]".