Facepalm time - MX records

PsyWulf

PsyWulf

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One of our people are having trouble sending mail to a specific domain so I check the bounceback message,says no valid Mail servers found for mx record:confused:

Look up the MX record,find this (removed relevant domain name):

mx:theirdomain.co.za mx
Pref Hostname IP Address TTL
10 mail.theirdomain.co.za 127.0.0.1 24 hrs

Almost fell off my chair laughing
 
Lol :p I guess they don't want any mail...
 
Phoned,they acknowledged that mail seems a bit quiet and they'll look into it
 
There is basically a "default" ip address of any network connection of 127.0.0.1 that always points back to itself basically.
That MX record specifies the mail server for a domain and it's specified the server as 127.0.0.1 which is just not going to work.

This also serves as an explanation of those nerd shirts that say "there's no place like 127.0.0.1".
 
Well this is the network admin section :P

But okay lets dumb it down hehe

Simplest:
When you send an email your Mail Server ( MaileXchanger ) looks at the address you are sending mail to ( [email protected] )
It then asks the "Internet name registry" what the mail server (MX) address is for recipientdomain.co.za
This in turn responds with a public IP address to connect to to deliver the mail,in this case it returns 127.0.0.1 - which basically means return to sender as it's not a public address but a loopback
 
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