FQDN's and mail MX's

[Ray Bush]

Jim Reid wrote:

> >>>>> "Ray" == Ray Bush <rbush at scryptography.com> writes:
>
>     Ray> Please help us settle a bit of an arguement here.  Should (as
>     Ray> in does it need to be) mail mx's be fully qualified domain
>     Ray> names?
>
> Didn't you try reading RFC1034? I quote:
>

Read the RFC and several others yet i have not found explicit wording
adressing the issue or forward and reverse matching entries or problems that
may be encountered in the various situations.

>
>                 MX              a 16 bit preference value (lower is
>                                 better) followed by a host name willing
>                                 to act as a mail exchange for the owner
>                                 domain.
>
> To the RDATA part of an MX record should have a hostname after the
> preference value. That hostname needs to have an A record somewhere
> else in the zone file (or in somebody else's zone file if it belongs
> to a different domain). To avoid mistakes, I'd recommend that the
> hostname is entered as a fully-qualified domain name (FQDN), explictly
> terminated with a dot. If this isn't done, the name server will append
> its idea of the current domain name - the domain origin - to get a FQDN.