Capitalization of domain names

[Jim Reid]

>>>>> "David" == David Kelly <david at samara.co.zw> writes:

    David> I have had a problem sending mail (via sendmail 8.9.3) to a domain that
    David> has its primary mail exchanger listing in mixed case.

    David> i.e. Mail.domain.com

DNS lookups are case insensitive, so unless you tell us what the
actual domain is, we can't tell you what's wrong. The most likely
explanation is domain.com doesn't exist or has badly broken name
servers and/or a mangled delegation. Or they could have a broken mail
system that generates junk mail headers with unrepliable addresses.
BTW, the name servers listed for the *real* domain.com don't seem to
be responding. However since this is an example "placeholder" domain,
this isn't unreasonable or unexpected.

    David> Zimbabwe's Finest Internet Service Provider

Hmmm...