Question

How to configure Reverse DNS for multiple virtual servers in virtualmin

I have read most of what i can find but cant find an answer.

Essentially I have a droplet with a domain that I dont use.

In that droplet I have Virtualmin and have three servers, each with emails.

They are having their mail blocked because there is no reverse DNS set up for the domains.

I have read that Digital Ocean sets up the reverse DNS automatically for the domain associated with it. However, there appears no way to set the reverse DNS for the sub servers.

How can i do that?

Just to make it clearer, I have a domain masterdomain.com that I set my droplet up on.

I have customer1.com on a virtual server setup in VirtualMin and his emails are being blocked because the domain lacks a reverse DNS PTR record or whatever you call it.

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@jceng Hi! I’m sorry about that. Unfortunately the spam filter catches some actual non-spam posts every once in a while. I’ve just published your post with the details and it should now be visible to everyone.

Well, I spend 10 minutes expanding on this only to have my answer blocked by Digital Ocean as spam


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Just to help out im including the error message

Reporting-MTA: dns; masterdomain.com X-Postfix-Queue-ID: 7D58E12032C X-Postfix-Sender: rfc822; customer@customer1.com Arrival-Date: Fri, 8 Apr 2016 10:12:19 -0400 (EDT)

Final-Recipient: rfc822; thirdparty@thirdparty.it Original-Recipient: rfc822;thirdparty@thirdparty.it Action: failed Status: 5.0.0 Remote-MTA: dns; mail.thirdparty.it Diagnostic-Code: smtp; 550 Your server IP address [1.2.3.4] is missing a reverse DNS entry. See http://spamauditor.org/best-practices/check-ip-reverse-dns/ for more information. Protection provided by MagicSpam 2.0.0-1 http://www.magicspam.com

PTR records are associated with the name of your droplet. By renaming your droplet, you set the PTR record associated with its IP address.