IP Address Move & Dealing w/ Mail

[fkatzenb]

For me, these two topics are related...

History:
I have 38 websites on my box shared among 5 IPs with two dedicated nameservers. About 8 websites send about 85-90% of the e-mail and consist of forums to mailing lists. As always, Yahoo is a pain and blocks everything from my server and I thought I was using best practices, but you never always know those best practices until you fail. I have others like AT&T and SBCGlobal that I have to get unblock about every 10-12 months.

With being slammed by Yahoo and them being very difficult with their cookie cutter responses and not reevaluating, I decided to take action. In addition to this, my resellers are finally starting to go somewhere and would like to get going to SSL, so it is time for IP additions.

In Process/Plan:
So I have ordered a large block of IPs. My goal is to move the host IP to the new block, move my resellers to the new block (2 each for them), leave the shared hosting divided up on the old IP block (with the exception of the one that is blocked by Yahoo), and take the time to realign my business structure to my new domain and business rollout I am doing.

Questions:

1. For adding these IPs, I know I just add them via "Add a new IP Address". However I see that option for "IP Migration". What does this do?
2. Outside of people's local PC DNS records needing flushed, what other gotchas should I be concerned about when I distribute those websites to the other IP addresses?
3. Once I have my new website setup and built on the new IP address, I just go over to "Change Host Name" to my new FQDN?
4. Besides needing to fix my reverse DNS entry for my IP address that I established in the previous question, should I be doing something special for the IPs that are being assigned to the resllers? Should I ask for rDNS authority from my DC? How important is this with respect to my next question?
5. In order to stay under the radar of folks like Yahoo with the # of e-mail per day, should I use "Automatically send outgoing mail from the account's IP address instead of the main IP address."? How does this effect me? I see that I need to reset everyone's SPF records, but that is manageable now before I begin to grow more.
6. What other features should I consider?

 

[fkatzenb]

Anyone have answers?

Thanks,
Frank

 

[Infopro]

Are all of these accounts using the same nameservers?

There's always going to be some time for propagation of course, that can't be avoided. But you might limit this a bit via WHM > Edit DNS Zone > select a domain from the list to edit and find the Minimum TTL and set this lower than the default (86400) if that's where its at now. You might search the forums for a way to edit all domains quicker than this, I'm just trying to plant the idea here of this being useful.

1) Here are the docs for the migration wizard you might also find useful:
IP Migration Wizard

2) I wouldn't worry to much about flushing peoples local DNS, you can of course, but the TTL adjustment should help.

3) Yes, and the TTL should help here as well.

4) "Should I ask for rDNS authority from my DC?" Yes.

5) Yes. You'd set your domains to this as well and it shouldn't "affect" you at all that the other domains would be doing this, if that's what you mean. A bit unclear on the question.
It is very important that your mailserver is setup correctly and if possible your server is running SuPHP. There's many threads on this sort of topic on these forums as we've all been there at one point or another and it's been discussed at length. Try searching for mailserver setup, or even a generic term like the word yahoo. I'm sure you'll find lots to read.

6) I'd suggest sticking with the advice in the second part of answer #5 above and see where it takes you. There's lots of Info on these forums that you'll be able to work with and get you were you're going easy enough.

Hope that helps a bit.

 

[fkatzenb]

Thanks for the advice. For the question I was kind of unclear about, let me do it this way.

Originally all my IP's reverse DNS would point to server.mydomain.com. However if one of my resellers have a dedicated IP, should I change their reverse DNS to match their primary domain?

Thanks,
Frank

 

[fkatzenb]

So I read the following post and it has me slightly swimming....
http://forums.cpanel.net/f43/question-about-mail-headers-hostname-ip-160174.html#post671214

I basically have this scenario:

111.111.111.1
server.primary.com
primary.com
sharedsites.com
importantsender.com

111.111.111.2
reseller-a.com
hiswebsites.com

111.111.111.3
reseller-b.com
herwebsites.com

111.111.111.4
dedicatedip.com​

Because of 111.111.111.4, I would select the following and update the file: Automatically send outgoing mail from the account's IP address instead of
the main IP address.

If importantsender.com can't be assigned a new IP address, I would then go thru the steps of mailips and mailhelo?

Of course for all dedicated, I would take care of the rDNS and the mail_reverse_dns file?

Should I do anything for the resellers?

Thanks,
Frank

 

[Infopro]

The docs should be helpful here:
Changing the Sending IP for Outbound Email in Exim

 

[fkatzenb]

Thanks for the great help.

So it would appear that any IP that has more then one domain assigned to it will not send out via that IP? So if I have a reseller plus 5 of his clients on one IP, it will instead go out on the IP address/HELO of the server, correct?

 

[Infopro]

...more then one domain assigned to it will not send out via that IP?

Depending on how you set it up by those docs, the mail would go out from the IP the account is on.