How to stop sending spam emails from our email addresses of a domain?

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From our email addresses on a domain leave letters to spamming customers.
Sometimes the kickbacks are coming from your missed letters we never sent (unknown to us addresses).

If I understand correctly the option of all three:
  • spam bot is sending out emails not from our mail server, and simply forges the signature of the sender resp. you need to check the headers of these spam emails? another question where is the spam bot know our addresses, they are not published on the website and addresses of our customers too, of course!
  • spam bot connects to our mail server - but we have changed passwords! where he could take more then?
  • a virus on your computer sends spam, but we checked and the virus scan again - all clear
  • on the website the malicious code carries out the distribution - but where did he get the addresses of our customers, we have no basis on the website
  • the mail server hacked on the server - but is this even possible?


what else? where to look? how to act?
by | 53 views

4 Answers

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DMARC+SPF+DKIM attitude and greatly diminished this shit.
by
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Take one particular spam email and read the title, you'll understand immediately where it comes from. In 95% of cases Your address was just forged, it's not hard.
What should I do to start new spf record for Your domain and server. Then, you and dkim to do. This is partly solve the problem but not remove it until the end.
100% of the solution has never been and is not.
by
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Open mail relay - forwarding through your server.
Close the settings of the mailer.
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The hosters where parked Donja write and indicate the article of the law on the spam from 100T to 500T the penalty. A little sorry for such srachi give, I would give at least 3years to these bastards spammers at the end of it was less, and hosterov trailer for this, too, fined, turned the Internet into the sewers.
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