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probuddha

join:2010-08-10
reply to graysonf

Re: Sending emails over Ipv6

Right...my concern as well.

I've seen Google supporting IP6 addresses but haven't seen Yahoo and Hotmail support it.

So in that case the emails won't be delivered to Yahoo and Hotmail


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
Reviews:
·Comcast
I think you are underestimating the impact.

You have no way of knowing where you will be sending mail to in the future, and of those destinations, which are IPv6 capable or not.

The best you can do, and the most sensible approach, is to configure both IPv6 and IPv4 addresses on your mail server and in your DNS A and MX records. Then if you wish and can, set your mail server to prefer IPv6 over IPv4 for outbound mail.

But in the end, it will always be the recipient domains that dictate how mail is transported into their servers, and that is not within your control.

probuddha

join:2010-08-10
Hi graysonf

Thanks a lot for your reply

I totally understand and agree to the concern you've raised...we'll be sending emails to a lot of other email servers other than that of Google, Yahoo and hotmail

This is how our DNS records are laid out now

The mail server and the A records and in fact all the other records are set on both an A as well as an AAAA address...

Now if I understand your solution properly, I need to set up another mail server with an IP6 address and set it's priority higher than the existing one that is using an IP4 address.

Is that what you're suggesting, thanks!


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
No, and I don't know how you got the idea that I suggested that.

You seem to be confusing outgoing mail and incoming mail, and how and where DNS is involved with both.

probuddha

join:2010-08-10
Ahh...sorry..I am a novice at all this and just trying to learn


leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
The MX records for your domain name determine the names of your incoming email servers (whether or not they also handle outgoing email is completely irrelevant) as well as the priority that determines in which order a sender should be trying them.

The A and AAAA records for those email server names provide the IPv4 and IPv6 addresses that are actually used to establish the connection to the email server. In addition the A and AAAA records are used as a fallback if a domain name doesn't have any MX records associated with it.

The same applies in the outgoing direction with the important difference being that it is the MX, A and AAAA records of the destination domain that matter instead of your own DNS records.
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