Dom
Member
Registered: 13th Sep 03
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I'm needing to get a PTR record set for a static IP where a mail server (SBS2008) sits on; am i right in assuming this PTR/rDNS should be the same as the MX record? Example - MX record is mail.domain.com, IP is 1.1.1.1 / IP rDNS is 1.1.1.1.location.code.isp.com, IPs PTR should be mail.domain.com (giving a rDNS of mail.domain.com).
Or am i completely missing it and barking up the wrong tree?
Also what happens when mail is pumped through an online spam/virus filter service (like Trendmicro) when the domains MX record actually points to trendmicro (eg - mx.1.trendmicro.com) and intern they fire mail over to mail.domain.com?
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VrsTurbo
Premium Member
Registered: 8th Jun 10
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When you have a online service on the service they will have an static IP of your ISP that it forwards the mail onto i would use an IP instead of DNS on the forwarder online
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Dom
Member
Registered: 13th Sep 03
User status: Offline
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quote:
Originally posted by VrsTurbo
When you have a online service on the service they will have an static IP of your ISP that it forwards the mail onto i would use an IP instead of DNS on the forwarder online
What's the reason to use the static IP instead of the A record? Surely this won't have any affect on outgoing mail from the SBS box if Trendmicro only handles incoming? 
Reason for needing to update this PTR record is because there are a number of ISPs/mail servers that check the reverse DNS on mail and block if there is a mismatch, which is what is happening when sending mail to AOL.
Having another look it appears mail is being sent from remote.domain.com (standard SBS2008 domain prefix), so would i be right the PTR needs to reflect this so a rDNS on the static IP would show remote.domain.com?
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VrsTurbo
Premium Member
Registered: 8th Jun 10
User status: Offline
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Set it in exchange also as it may not being doing a rdns is may just be header checking.
I just prefer to use IP over A record when using filtering solutions guess its personal preference really as some of the chumps that deal with dns can fuck it from time to time.
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