DNS and cached files

[Fraser Campbell]

Robert F. Kennedy wrote:

> robust I also added a backup MX server with dnsmadeeasy.com. When I did
> this I set my mail server and the backup server to the same priority
> number of twenty. I quickly got feedback on my mistake and set my mail
> server to 10. Most emails go throught now but occasionally some come

Here's what I see:

   shambhalatoronto.org mail is handled by 20 mail.shambhalatoronto.org.
   shambhalatoronto.org mail is handled by 30 mx2.dnsmadeeasy.com.
   shambhalatoronto.org mail is handled by 40 mx3.dnsmadeeasy.com.
   shambhalatoronto.org mail is handled by 20 mx1.dnsmadeeasy.com.

Since mx1.dnsmadeeasy.com and mail.shambhalatoronto.org still have the 
same priority you will have trouble.

> back with the Postfix "mail loops back to myself" error. Also, checking
> on my MX settings with dnstuff.com show the old settings. I made the
> changes more than a week ago, is there a way to speed up the updating of
> cached files? The server is shambhalatoronto.org.

If you *really* changed your MX to priority 10 then probably the step 
you forgot was to update the serial number in your master zone.  If you 
don't change your master's serial number the slaves will never retrieve 
the updated zone and roughly 3/8 of the emails to you will loop.
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