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Old 11-06-2016, 11:29 PM   #1
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How to specify rdns for multi-homed server

I have a webserver that host multiple domains. emails get sent from this host to members of the various domains with their domain in the email address:,, etc. I have MX records for these domains and sendmail is configured with these domains in /etc/mail/local-host-names.

The problem is, I need to specify reverse DNSes for these hosts or some recipients ( reject the messages and I end up listed in spamhaus.

My ISP sets up rdns and in the past I've only give one domain to the ISP. How do I get this straightened out? Do I have to give the ISP each domain so they can create individual rdns lookups?

Last edited by mfoley; 11-07-2016 at 12:14 AM.
Old 11-07-2016, 05:58 AM   #2
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hosts, rdns

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