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Exchange reverse DNS

By Jellimonsta ·
Hi all,
We have a very strange situation (this is not a technical question as I have found the fix but I do not like it). Anyway, we are using Exchange 2000 server. We recently found we had some problems sending Email to a few sites, and looking around internally I called the ISP to see if the problem was there. We found that the reverse DNS PTR record was missing. I also found the DNS setting on the Exchange virtual server was set to the server name as opposed to the MX alias. We also found a few other little things and rectified them all. This resolved the problem for all of the domains bar one.
I worked with their ISP and my ISP for quite a while to see if we could resume communication with this domain. After getting another vendor in the game he also found he was unable to send Email to this one particular domain.
He called me after a few hours and said the Email was successful when he removed the option to 'perform reverse DNS lookups on incoming mail'. I tried it and what do you know it worked. My question though was, why would performing reverse DNS on incoming Email prevent us from sending Email to 1 domain? More to that fact, why would incoming reverse DNS prevent us from sending full stop?
I posted the situation on the Exchange message board also and got a reply referring to reverse DNS being blocked by the recipient, but would that not cause problems with their Email to us?
Strange forces at work here kids?!?!
Mike <

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