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We use postfix as internal and external relay and Exchange inside the organization. Our company is receiving a lot of SPAM and phising mails whose Sender is our own company domain. Searching Exchange Message-trackingLog I realized that altough the Sender is "ourdomain.com" the Return path is another.

Sender : userx@ourdomain.net ReturnPath : astrid.montoya@gmaritimo.com

I would like to configure in Postfix so that incoming emails that have our domain are blocked.

Thanks in advance.

Maximiliano
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  • @MrShunz I have a problem with your linked question. That question explicitly asks not to use SPF or DKIM. But properly configuring SPF and/or DKIM is the proper solution. – kasperd Jan 22 '19 at 14:56
  • @kasperd I agree... flag retracted. – Daniele Santi Jan 22 '19 at 15:14
  • It is suggested that implementing SPF for your domain and testing sender SPF in Postfix. https://serverfault.com/questions/905591/receiving-spam-from-my-own-email-address-postfix – Kelvin_D Jan 23 '19 at 09:03
  • After you have set up SPF and DKIM, then I would also look at setting up DMARC https://dmarc.org/overview/ – mrjamesmyers Jan 23 '19 at 22:01

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