MX DNS Records
I would like to know what to put for the MX records of client sites I host.
server.com - 220.127.116.11 - This is the address and IP of the physical hardware. It runs the mail server, mail.server.com
client.com - This is the domain name of the client website.
I have a few choices as I see it.
1. Just set the MX record to mail.server.com for every client.
2. Set the MX record to mail.client.com and have an A record pointing mail.client.com -> 18.104.22.168
3. Set the MX record to mail.client.com and have an CNAME record pointing mail.client.com -> mail.server.com
I'm trying to figure out what the best thing to do is from:
1. A maintenance point of view (likely to move servers in the future)
2. Receiving servers point of view (are any of the options less likely to get email from email@example.com bounced / help with reverse DNS lookups)
Thanks in advance.
2. Doesn't matter, the other end will always see the mail as coming from mail.server.com so as long as that has the corect rDNS you should be fine.
Thanks for the quick reply.
I'd totally forgotten about the SSL aspect of this, I think I'll have to go with option 1. (Just set the MX record to mail.server.com for every client.) because I don't want folks ringing me up re certificate errors.
I don't really want to fork out for a wildcard certificate so I think when I move server I'll set up mail1.server.com, buy an ssl for mail1, shift the accounts, and then add mail.server.com CNAME mail1.server.com.
As part of the move I was looking to expand to a couple of servers, and move sites and email clients between servers as necessary to balance the load. I was hoping that by using option 3, that I could change the CNAME records and make the move transparent to the end customer. E.g.
Before: Client1's email boxes on mail1.server.com and mail.client1.com CNAME mail1.server.com
After: Move the client1's email boxes to mail2.server.com and do mail.client1.com CNAME mail2.server.com
Is there anyway to achieve this without getting certificate errors? Maybe a way to redirect (like a web 301) mail.client1.com to mail2.server.com. Basically, looking for a way to move some email boxes without having to trouble the customer.
Thanks for your help.
I guess it depends on what you offer your existing clients now. if they are connecting to mail.client1.com, does it have a correct ssl certificate? If you don't have any existing clients using an ssl connection method then you might get away with the cnames.
I know moving clients to new servers is always a problem unless you are a big company with huge resources, there never seems to be an easy way.
Theres not much I can help you with about moving existing clients to new servers - best bet is to test it with a dummy setup and see what happens yourself, and see what you can do to get around the problems.
I do suggest however, if you are going to have multiple servers to serve your clients you look deeper into having all your servers under the one domain and using a wildcard ssl. if you hunt around you can get a wildcard for a reasonable price - compared to buying individual certs for server1, server2 etc. It's something to look into as it helps with a number of other things not just mail. Maybe check out places like godaddy and search around for coupon codes - you can often end up with a price not that much different to buying a couple of standard certs.
I'll have another look at wildcard certs again.
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