Solved

DNS, rDNS, SPAM, and Multiple Domains

Posted on 2014-10-07
4
94 Views
Last Modified: 2014-10-09
We are in the process of buying out a company and along with that, come their email.  We learned the hard lesson about DNS, RDNS, and domain name resolution for spam purposes.

What we need to know is, how to tie multiple domain names to 1 rDNS record.  I would imagine that this is not possible, but on the other hand, I see where large hosting companies would have to do this without having to consume large blocks of IP addresses....
0
Comment
Question by:CandSNetworking
  • 2
  • 2
4 Comments
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
Comment Utility
The PTR record (reverse DNS) does NOT have to match anything connected to the domain the email is coming from.
Therefore as long as the three records all match (A record, PTR and the SMTP banner) then you should be fine with regards to email delivery.

There are not enough IP addresses in the world for every domain to have its own for PTR purposes. I am aware of one server in the USA that hosts email for over 250,000 domains, single host name.

The common trick when it comes to hosting multiple domains is to have a single generic domain that is used for the MX record for all domains.

Simon.
0
 

Author Comment

by:CandSNetworking
Comment Utility
So, you're saying that the MX of company 2 needs to simply be the MX of company 1?

So, if my first company has published mail.company1.com as my MX, and we buy Company2, we just set the MX record for company2 to the same setting as company 1?

Are you aware of a simple document that would outline how to achieve this?

Thanks Simon!

Sky
0
 
LVL 63

Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
Comment Utility
Yes, that is all there is to it.

There is no connection between the MX record host and the domain that you are sending to.
All an MX record does is tell you that an email for example.com goes to host.example.net,

Nothing else has to be done - just make the change of MX record host in the control panel for wherever the domain is hosted.

Simon.
0
 

Author Closing Comment

by:CandSNetworking
Comment Utility
Thanks Simon.  We're moving forward now, thanks to your help.
0

Featured Post

How to improve team productivity

Quip adds documents, spreadsheets, and tasklists to your Slack experience
- Elevate ideas to Quip docs
- Share Quip docs in Slack
- Get notified of changes to your docs
- Available on iOS/Android/Desktop/Web
- Online/Offline

Join & Write a Comment

Introduction Ever had certain email messages or responses that you find yourself using over and over again? Do you use Google's Gmail system? If so, then this article is here to help you save time by teaching you how to create email templates from …
Email signatures have numerous marketing benefits. Here are 8 top reasons to turn your email signature into a marketing channel.
The purpose of this video is to demonstrate how to set up Lists in Mailchimp. This will be demonstrated using a Windows 8 PC. Mailchimp will be used. Log into your Mailchimp account. : Click on Lists. Click on Create List Button : Choose the desi…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now