mail-dns-records.txt

Pseudo code for setting a domain's host records via its registrar's API:
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=== Given three physical servers:

host servers' FQDN, IPv4, and role:
----------------------------------
host2.mydom.net - 2.2.2.1 - web server
host4.mydom.net - 4.4.4.1 - backup mail server
host6.mydom.net - 6.6.6.1 - primary mail server and
                  webserver for managing lists

=== Given multiple domains:

  mydom.net     # primary ("real") domain
  example.com   # "virtual" domain
  example.org   #    "        "
  example.net   #    "        "

=== Step 1. For each domain EXCEPT 'mydom.net' set DNS records:

@            A    2.2.2.1
*            A    2.2.2.1
lists        A    6.6.6.1
mail         A    6.6.6.1
mail-backup  A    4.4.4.1
@            MX   10 6.6.6.1
@            MX   20 4.4.4.1
@            TXT  "v=spf1 mx -all"

=== Step 2. for 'mydom.net'.net ADD DNS records:

host2  A    2.2.2.1
host4  A    4.4.4.1
host6  A    6.6.6.1


=== Step 3. for each domain (SLD.TLD) add rDNS records (submit to my ISP):

1.6.6.6.in-addr.arpa. IN PTR mail.SLD.TLD.
1.4.4.4.in-addr.arpa. IN PTR mail-backup.SLD.TLD.


=== Note: Later, add appropriate records for DKIM, SPF, IPv6, etc.