JP
Guest
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 Posted:
Tue Feb 15, 2005 7:01 am Post subject:
PTR record |
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Here is my setup and issue. I am having issue with a few domains bouncing my
email connections. I know I am not on any spam lists and I have spoken to one
of the Admins of the domains that is giving me an 550 SMTP error and he
suggested it was more then likely an error with my PTR record for my domain.
Here is my setup I have a PIX 515 at the edge of my network and between my
intrenal network and the PIX I have an ISA 2004 server for an inside
firewall, for extra security and to publish my Exchange 2003. So it goes Pix
515 > ISA 2004 > Symantec SMTP security server > Exchange 2003 server. (This
is not my real email server name, domain, or IP address. These are just
examples) My exchange server is email1.domain.com and the MX record is
10.10.10.2 and the outside address of my PIX 515 that is used to NAT all
internal outgoing traffic is 10.10.10.1. Because my email server
email1.domain.com is behind my ISA server and because ISA can't do one-to-one
NAT on outgoing traffic my outgoing SMTP is NAT'd to the same address as all
other outgoing traffic. 10.10.10.1 but my MX record is 10.10.10.2 for
incoming email. Should my PTR record for my email system be set to point to
the IP address of my PIX since that is the IP address that the traffic is
going from or should it be the IP address of my MX record? Should the
hostname that the PTR record resolves to be the name of my email server
email1.domain.com? If I point the PTR record to the ouside IP address of the
PIX (10.10.10.1) and the MX is (10.10.10.2) will this cause any other issues
down the road. I hope this make sense. Thanks for any help. JP
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