auto relaying for subdomains -- why?

[Igor Podlesny]

My greetings!

I  noticed  that  some  mailers (sendmail, postfix) in case they allow
relaying    for    somedomain.zone    also    allow    relaying    for
subdomain-of.somedomain.zone.

I can accept this as reasonable behavior but would like to know how to
deny it! :) Also I wish to know what was the actual idea behind this?

P.S.  I  searched  for  answers through Inet, digging RFCs but nothing
have found yet...

-- 
Best regards,
 Igor                          mailto:[EMAIL PROTECTED]



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