W Twoim liście datowanym 2 stycznia 2006 (18:51:25) można przeczytać:
GS> You want multiple IP Addresses for email if you are hosting more than
GS> one domain. The reason is, everyone now checks for reverse DNS with
GS> email so you need a different public IP Address for each email domain.
GS> This way, all the reverse DNS translations will be unique.
IMHO it is not true. Novadays, it is required for a mail server to
have a valid reverse dns record. But it doesn't have to point back to
the same name. It would lead to very very poor IP space usage - eg.
virtual hosting provider, which has 300 domains would need 300 IP's
even if all of them are hosted on 1 machine, and number of domains can
MUCH higher than all of the IPs.
mail.domainA.com - WW.XX.YY.ZZ
ZZ.YY.XX.WW.in-addr.arpa PTR - host.domainB.com
host.domainB.com - WW.XX.YY.ZZ
for an egzample one of the bigest portals - yahoo:
dig yahoo.com MX - mx1.mail.yahoo.com - 67.28.113.10, 67.28.113.11
dig 10.113.28.67.in-addr.arpa PTR - mta-v4.level3.mail.yahoo.com.
dig mta-v4.level3.mail.yahoo.com. - 67.28.113.10
Citation from one of the mail server manuals:
If you have a PTR record for your IP address, and the target
of the PTR record has an A record pointing back to that same
IP address, mail will not be rejected from your server due
to an invalid PTR.
--
Pozdrowienia,
Robert Kurjata
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