Same MX Record regitered with different ISP's?

[rocketlauncher]

Hello Everyone,

Hopefully someone can clear these questions for me.

We currently have the following:

- domain1 (hosted with ISP1)
- domain2 (hosted with ISP2)
- one internal Email server (Exchange), accepting emails for both domains.

I've noticed that we have the same MX Record and A record at both ISP’s, pointing to the same host and same IP address respectively, but with different priority number. See below:

Host Priority IP Address
mailhost.domain1.com 5 99.99.99.99 (ISP1 MX Record)
mailhost.domain1.com 1 99.99.99.99 (ISP2 MX Record)

I would like to know:

1) If this can cause a DNS issue? (I would think slow resolution because of the different priorities)
2) Is it necessary to have multiple MX Record pointing to same host with different ISP's? (if not I’ll go ahead and delete one)

Any suggestions are truly welcome.

Thanks,

Rocket

 

[brichr]

I would say it's not a problem. As long as the information is correct in both locations for other mail servers to do reverse lookups(which it looks like it is). You might want to delete one just because of administration reasons. If you change the IP ever you better remember to change it in both places or face the consequences.

 

[rocketlauncher]

Hi Brichr,

Sorry for the late reply, I appreciate your help.

Then I'll leave it alone for now, since it has been working fine for now and we are hosting eache domain with different hosting companies.

Thanks!

Rocket.