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As the message told you, 2001:41d0:e:4c8::1 has no reverse DNS entry set. To solve the problem, you need to set the reverse DNS for this to the proper hostname value, that also resolves to the same IP address. You can do this within your OVH management panel.


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The simplest solution is to run two mail servers on premise. One handles only incoming mail, while the other handles only outgoing mail and knows nothing of the first server.


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Think of SPF and DKIM as ways to validate the mail path, and think of DMARC as an extension that also validates the message sender. Think of this as delivering a FedEx letter. It's easy to validate where the envelope was shipped from, and that the courier was legitimate, but it doesn't provide a way to prove that the letter inside the envelope is really ...


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1) yes, likely the dmarc failure will cause gmail to junk your mails 2) also would be interested in an answer for this 3) I would (and we do) use the reply-to field for the customer address, our mails look like this: from: website@mydomain.com to: user@mydomain.com subject: contact form reply to: customer-addy@somewhere.com Hope this helps


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The correct solution to stopping backscatter without allowing harvesting of emails is to reject email for nonexistent users, but also use fail2ban to block directory harvesting attacks. So after the first few in a row from the ip it will get blocked. This gets the best of both worlds. By rejecting during SMTP, backscatter is prevented. By using fail2ban to ...



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