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I have a web server that talks to a mail server when sending an email. Now I'm hosting my own DNS, however, since then I see that one of the email headers says:

Received: from webserver.domain.com (unknown [192.168.0.1])

where webserver.domain.com has the IP 192.168.0.100 and the router where is connected has 192.168.0.1, before I used to see the hostname of 192.168.0.1 (router.domain.com)

In the 192.168.0.rev zone I have: 1.0.168.192.in-addr.arpa. IN PTR router.domain.com.

and domain.com.db has: router IN A 192.168.0.1

/etc/resolv.conf on the web/mail server:

domain domain.com
search domain.com
nameserver 192.168.0.101
nameserver ISP address

Am I missing something? Thanks!

sysadmin1138
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Mike Darrow
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1 Answers1

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You probably also need to put a PTR entry into your local zone for webserver.domain.com like 100.0.168.192.in-addr.arpa. IN PTR webserver.domain.com. The message you see indicates that your mail server (presumably running on router.domain.com) does not recogmise a valid PTR record for webserver.domain.com. Though, I would expect the header to read: Received: from webserver.domain.com (unknown [192.168.0.100]) ...

Mike Insch
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  • I tried adding a PTR entry as you mentioned, however, still same thing. BTW, I'm using a sendmail emulation to talk to the mail server. – Mike Darrow Jul 14 '11 at 14:39
  • Where is the mail server installed, does the mail server run on `router.domain.com`, or is the mail server external to your network? – Mike Insch Jul 14 '11 at 15:27