How can I make my site accessible by domain.com as well as www.domain.com without blocking Exchange email

Question

Right now my DNS settings look something like this:

| Host Name    | IP Address/URL                  | Record Type |
| ------------ | ------------------------------- | ----------- |
| www          | my.dns.com                      | CNAME       |
| autodiscover | autodiscover.outlook.com        | CNAME       |
| ftp          | my.dns.com                      | CNAME       |
| @            | v=spf1 include:outlook.com ~all | TXT Record  |
| @            | me.mail.eo.outlook.com          | MX          |

When I change them to look like this...

| Host Name    | IP Address/URL                  | Record Type |
| ------------ | ------------------------------- | ----------- |
| @            | mydns.com                       | CNAME       |
| www          | mydns.com                       | CNAME       |
| autodiscover | autodiscover.outlook.com        | CNAME       |
| ftp          | mydns.com                       | CNAME       |
| @            | v=spf1 include:outlook.com ~all | TXT Record  |
| @            | me.mail.eo.outlook.com          | MX          |

... my Exchange email stops working.

I want to be able to access my website at domain.com www.domain.com, and ftp.domain.com while still receiving email. What am I doing wrong?

Answer 1

Your record for mydns.com needs to be an 'A' record with an IP address and not a CNAME.

| Host Name    | IP Address/URL                  | Record Type |
| ------------ | ------------------------------- | ----------- |
| @            | mydns.com                       | A           |

Any 'MX' record must be attached to a corresponding 'A' record.

If you were to create "subdomain.mydns.com" it would need to be an 'A' record to attach an 'MX' record to it. A 'CNAME' won't work. Same goes for the naked domain.

You can get feedback on your public DNS configuration at http://intodns.com. Just plug your domain in. It will give you some suggestions.