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791 posts

Ultimate Geek


# 132209 12-Oct-2013 17:20
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Exchange server 2010 can send mail but no receive anything.

Current setup :


PTR --> x.x.x.1 (internal ip) point to (public ip)
domain controller = x.x.x.1 ( )
exchange server = x.x.x.2 (internal ip)

iv setup the the PTR in the DNS server on the domain controller.
Have also setup the forwards in DNS Server on the domain controller.

For some reason the mx record keeps showing the local ip ( x.x.x.2 ) on

Any idea why it keeps showing the internal IP of the exchange server?

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Cloud Guru
4060 posts

Uber Geek


  # 914199 12-Oct-2013 19:19
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can your exchange server be seen from the internet? i.e. if you telnet to port 25 on your external ip do you get the "220 Microsoft ESMTP MAIL Service ready" banner?

not quite sure i understand what you're doing with DNS and PTR/MX records. normally you have an A record, a PTR (if available) and an MX record.

note that a PTR record is *not* required for mail delivery. If you don't have one, you may be more likely to get blocked as spam by other mail servers.

an MX record *is* required. This is what tells other servers where to send mail for your domain.

e.g. (if your ext IP was

External DNS records: A MX 10 PTR

Internal DNS records (if using split brain DNS): A MX 10 PTR

Normally external dns servers do not show internal records unless you explicitly load them. Not sure how you ended up with an internal IP address there.

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