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MX records verification

Posted on 2007-07-25
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Last Modified: 2012-05-05
I am trying to verify the MX settings on my DNS server.  My mail is not hosted on the same machine as the domain.  The mail server is at another server.

cmgva.com    14400    IN    MX    70.165.67.32
mail    14400    IN    A    70.165.67.32


Is this correct?
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Question by:CompuTurk
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Chris Dent earned 2000 total points
ID: 19567186

Not quite... this answer does depend a little on exactly where you're showing us the lines from. Still, at first glance it should be:

cmgva.com.    14400    IN    MX  10  mail
mail    14400    IN    A    70.165.67.32

IPs shouldn't be used in MX Records, it breaches the RFC recommendations on these things which causes problems. And it needs the 10 (or another number) there as the Priority of the particular MX Record.

If this is from an actual zone file you will need the trailing . after cmgva.com otherwise DNS will read it as:

cmgva.com.cmvga.com.

The origin is always suffixed to the record unless the record is terminate by a dot. You could also leave that blank or use the @ symbol there:

@ 14400 IN MX mail

@ works better in this case as you're also including a Time To Live as part of the record.

The use of the Priority becomes much easier to see when you have multiple MX Records. e.g.:

cmgva.com.  14400 IN MX 10 mail.cmvga.com.
cmgva.com.  14400 IN MX 20 backupmail.cmvga.com.

HTH

Chris
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by:CompuTurk
ID: 19576418
Thank you.  I just made the changes.  I will see how things go.  By the way, why did you change the  0 before mail in MX to 10?
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by:Chris Dent
ID: 19577940

Which 0?

I missed the priority out of this one:

@ 14400 IN MX mail

Otherwise they're all 10 or higher?

Chris
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by:CompuTurk
ID: 19590250
I kept mine at 0.  What is the path to zone files in Unix?  I would like to verify the settings by looking at the actual configuration file.

Thank you for your help so far.
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by:CompuTurk
ID: 19644074
Thank you!
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by:Chris Dent
ID: 19682559

Sorry for the long wait for a response, moving house and getting an internet connection took far longer than expected.

It depends a little on what you have running.

Default for the Zone Files is /var/named.

Chris
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