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I have a virtual server with one IP x and have multiple sites a.com and b.com running on it.

When accessing x in the browser, I get to homepage a.com.

Sending an e-mail from a.com to GMX is without any problems. Sending an e-mail from b.com to GMX leads to following error:

host mx01.emig.gmx.net refused to talk to me: 544-gmx.net (mxgmx101) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record.

I contacted the hoster which told me to setup something called "Reverse Delegation" to point the IP x to b.com. But don't I just shift the problem?

What is best practice for sending e-mails from a shared hosting environment?

Regards, Rokko

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  • duplicate of serverfault.com/questions/587989/…
    – Xavy
    Jan 15, 2016 at 11:10
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    @Xavy I don't think it's a duplicate; it seems the author knows what he's doing, what a PTR record is and how to set it up. The question is actually: How to handle multiple domains in a shared hosting environment. He got advice, but thinks, doing so would "just shift the problem", and I think so as well. Maybe worth trying out would be multiple PTR records, but I (like many other people) doubt this would lead to expected results.
    – gxx
    Jan 15, 2016 at 11:14
  • True, I've re read the question and you're right
    – Xavy
    Jan 15, 2016 at 11:32

1 Answer 1

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You should set up a single MX entry for every domain you handle on that server, say

hosteddomain1.com MX 10 mail.mycompany.com
hosteddomain2.com MX 10 mail.mycompany.com
hosteddomain3.com MX 10 mail.mycompany.com

and then create the PTR pointing to mail.mycompany.com.

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