Protecting Your Small Domain from Spam Hijacking?

Black Cardinal asks: "I have a small domain which I mostly use to post family photos and some software. I also use it to manage a few e-mail addresses that my wife and I use. A spammer recently hijacked my domain name, using it to construct fake return addresses for sending spam (without actually cracking my host account), and caused a flood of undeliverable mail messages to be sent to my domain hosting service, which promptly suspended my account. At the moment it looks like I may never be able to have any @gelhaus.net e-mail again. What can I and my domain hosting service do now to protect their incoming mail servers and my account from this kind of attack, and how can I protect my small domain from this kind of hijacking and allow me to keep it running?"

"My domain hosting service, CubeSoft, has been a good host for my domain for the past three years, and they have been very helpful in re-enabling most of my account, but at the moment they don't want to re-enable my e-mail because of the flood of returned spam coming in (30,000 messages per day). Since the return addresses are all invalid (e.g. 'nonexistent_address@gelhaus.net'), I would think it would be simple to filter out all messages that aren't specific ones I've set up (e.g. 'valid_address@gelhaus.net'). I can't believe my domain is the first to have experienced this problem. It would be a tragedy to have to just shut down my domain because of this. CubeSoft says there isn't any way to prevent it because there is nothing that stops a spammer from using a fake return e-mail address. What have others with small domains done to protect themselves?"

Comments

Use SPF to protect against "Joe Jobs"

[Karl J. Smith]

If everyone uses SPF, it will cut down on spam and joe-jobs.

See http://spf.pobox.com You can publish your DNS now, indicating which legitimate IPs are in use for mail from your domain.