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email problem -- (Unregistered domain?)

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by dherde 2 views

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I have a corporate email structure that is probably typical in that our incoming email enters our system via our corporate mail server in Japan(company.co.jp) and is distributed to the division email servers (division.company.co.jp) through our WAN. Our outgoing email (non-internal) goes straight out from our local mail server (division.company.co.jp) through our local internet port / ISP. Here is the problem.. Evidently, due to virus propagation, companies are screening (rarping?) mail requests to assure the mail is coming from a valid mail server with a valid mx record. Given the scenario laid out above, they are checking our domain (division.company.co.jp) against our local firewall IP address which is registered to our local ISP and does not match up with our IP address range and mx record assigned to our corporate domain mail server. Is there any way to fix this short of registering a new domain name, putting an mx record out there for ourselves (company.com) with our local ISP and exposing our local mail server to the internet? (Along with changing everybodies email address and having to deal with incoming virus scanning,etc., etc, etc.? Our corporate does these services for us and I would not want to take them on locally. Am I correct in my analysis (Guess) of what is going on, or is anyone aware of what the true story is?
Thanks...
David

3 replies

by blitzsonik

Make sure your ISP has the same IP for the PTR record as they do for the A record in their DNS.

We had this same problem with Earthlink. Our A record did not match our PTR refcord so Earthlink would never let our email go through.

The above solution worked just fine for us.

by blitzsonik

Make sure your ISP has the same IP for the PTR record as they do for the A record in their DNS.

We had this same problem with Earthlink. Our A record did not match our PTR refcord so Earthlink would never let our email go through.

The above solution worked just fine for us.

by dherde

I am not sure that I understand what you have said here. My local ISP does not have an A record or a ptr record in their DNS server as we have no local domain name. The overseas ISP and holder of the corporate domain name handles incoming only and has no pointer to our local email exit point (they can't as far as I know. Or can they?) Please explain further.
Thanks..
David

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