Domain Being Used To Spam

I have noticed recently that my domain is being used to send out spam. I don't know how but people are sending out emails using emails using my domain. That means people are receiving emails from non-existent email addresses from my domain. How do I stop that?

 

they are most likely just spoofing the headers or altering the from section to make it appear its coming from, but its really not.

 

Which is flooding my mailbox since the spam seem to be sent to addresses with auto-responders.

 

hard to stop that, if not impossible. spoofing headers isn't difficult.

 

Is there any way to implement some security or prevent it?

 

It is impossible to prevent spammers from pretending that email comes from someone at your domain. Spammers always use other people's email addresses in the sender and reply to portions of the email header. The only way this can be stopped is if every single mail server and relay point on the internet verifies that the senders email originated from the mail server(s) listed for the specific domain.

This is not impossible. But, it is not being done. Doing so would involve gaining the cooperation of hundreds of thousands, perhaps millions of individuals around the world. Mistakes in implementation will happen, as well as issues when there are delays/problems getting all MX records for domains.

 

If it is not being sent from your server, there is nothing much you can do about it. Some trojan does that by using infected account's email Address Book and send out those spams and so on. As long as the email header does not show that it originates from your server, you should be alright, it is just irritating.

 

Well, I can help you little if you post the headers here.

 

if theyre spoofing from non-existant emails, then change your domain's email settings so theres no catch-all address (that way the bounces/autoreplies won't end up in your inbox and would instead be rejected by your mailserver)

hope this helps!

 

You can block it many way. Like Chilli says above, just use "No catch-all" setting. Then you will receive only emails for which you have the addresses and rest discarded automatically. If you can't do that because any important message or potential customer of yours can be discarded than just create a few filters. You can discard hundreds of emails by just filtering and blocking few main "From" addresses like "Returned mail", "Mailer Demon" or "Mail delivery failed".

This is a world-wide problem. None of the governments are doing anything about it. Biggest wastage of man/work-hours in every country.

Bill

 

I subscribe for that solution to.

 

I am trying out the disabling of the catch-all function so that I don't get those bullshit again.