>Is this Imail failing to connect to 66.113.135.14 and then last ditch
>attempting to connect to 66.113.135.210 ?

the RFC say that the domain.name should not be tried if MX records exists 
but don't respond.

Since two MX records exists domain.name, Imail should not be sending to 
domain.name.

If the MX records don't exist, the RFC says to try this:

domain.name.  MX 0 domain.name.

>I've gotten round this by using the hosts file for now, however this isn't
>correct behaviour for a mail server surely ?

no, but "there's a lot of (RFC) broken software out there".

Len


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