I have a vanity domain with email hosted by GMail and forwarded to my regular Gmail account. It appears that the From: line of the primary address I use has been spoofed on multiple Spam messages, and lately I have been receiving a ton of auto-replies from random addresses (i.e. not ones in my addressbook).
While most of the bounces (e.g. from Postmaster, MAILER-DAEMON, Mail Delivery System, etc.) are caught by the first gmail account and not forwarded on, a small number of them are still getting through to my regular account. Is there anything I can do at this point to stop this or prevent the emails from being created in the first place?
I've got two-factor authentication set up in both places, strong passwords, and there's nothing in the Sent Mail outboxes of either of the accounts.