Quick question regarding how email works

josesan311

Active Member
Oct 29, 2007
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0
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Hello,

Im currenly using 4 cPanel servers (server.domain.com, server.domain2.com, server.domain3.com server.domain4.com) to load balance an email application that send mails to a lot of my customers (autoresponder plus) and im not sure how should i configure the rDNS on each server.
Im currently sending emails from [email protected]. What i did is i transferred the same cPanel account (domain.com) to the rest of all the servers included mailbox [email protected] so when the program logins to each of the 4 smtp servers previously mentioned the software sends the emails from the user [email protected].
My question is, should i need to setup the rDNS on every main server IP to the same record? I mean setup the rDNS to point domain.com. Or should i setup the rDNS to point each server domain? Ex. setup main server ip of server.domain2.com rDNS to domain2.com and NOT domain.com.

I hope i have been clear and you guys could understand this situation.

Thank you for wasting the time to read this post. I will really appreciate any suggestion you can advice.

Thank you in advance!

Cheers.
 

sparek-3

Well-Known Member
Aug 10, 2002
2,019
225
368
cPanel Access Level
Root Administrator
My understanding of how most mail servers recognize reverse DNS is that an IP address needs to resolve to a hostname. In turn that hostname needs to resolve back to that IP address.

So in essence you would have something like:

192.168.0.1 resolves to host.domain.com
host.domain.com resolves to 192.168.0.1

It doesn't really matter if the envelope-sender of the message is an @domain.com or @host.domain.com e-mail address.