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I am using namesilo.com domain registration and am trying to setup an MX record to point back to my linux server so I can install postfix. But these settings do not work:

DNS Settings Screenshot

Is there anything else I need to do? If I ping mx.wishd.me I get nothing.

$ ping mx.wishd.me
ping: unknown host mx.wishd.me
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2 Answers 2

You've mixed up the "name" and the "address value".
Also you've failed to define the A record for your mailsystem.

You'll need these 2 records.

A    mx.wishd.me ip.ad.dr.es NA 3600 
MX   wishd.me    mx.wishd.me 10 3600
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are you sure i mixed up the name/address? Because the form only lets me enter a sub-domain in the first field. –  chovy Oct 21 '12 at 0:32

Change the "NAME" of your MX record to be wishd.me

To explain it a bit further:

The MX record consists of:

NAME, CONTENT, PRIORITY, TYPE and TTL

You want NAME to reflect the bit after the @. E.g. myname@example.com

The CONTENT must be the hostname of the mailserver, which is supposed to handle the e-mail, for the NAME - in your case, wishde.me.

The PRIORITY must be a prioritized list of mailservers. If you have a backup mailserver, you would typically create that with PRIORITY 20. That would cause mailserver around the world to say "Well if the one with the lowest priority does not work - let's try the next one"

TTL is the Time To Live like any other record.

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