IMail Server 7.1 User's Guide - Setting Up DNS for the Primary Mail Host

Setting Up DNS for the Primary Mail Host

For background information about DNS records, see "Appendix I: Mail Servers and the DNS".

You need to make the following entries for your primary mail host in your DNS:

An MX record for the mail domain (for example, domain.com). The MX record identifies the host name of the computer running the mail server (in this case, the IMail Server computer).
An A record for the host name of the computer running IMail Server. The A record maps a host name to an IP address.
A PTR record for the IP address of the computer running IMail Server. The PTR record maps an IP address to the host name and is used for reverse lookups.

As an example, the DNS entries for a host for which the official host name in IMail Server is mail.domain.com would look like:
SOA 
$ORIGIN 
... 
domain.com 
     IN MX 10 mail.domain.com (MX record) 
     mail IN A 156.21.50.5     (A record) 
	(PTR record) 
5.50.21.156.in-addr.arpa.,type = PTR 
 host = mail.domain.com 
A DNS lookup for mail sent to user@domain.com would find that the mail must be sent to the host mail.domain.com.

Ipswitch, Inc.
http://www.ipswitch.com


©Ipswitch 2002