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| Hi,
We've been using IIS6 as an edge SMTP relay, protected with ISA 2004, for
the past year now, and everything has been working pretty well, until
yesterday, when one of our users got an email returned with the following
error:
Your mail system could not find a way to successfully communicate with the
destination system. Please notify your administrator.
<isasvr #5.5.2 smtp;504 5.5.2 <isasvr>: Helo command rejected: need
fully-qualified hostname>
Is this happening because the name of our mailserver on the internet is
setup as mx.domain.com in DNS, but internally its just isasvr? Why would
this suddenly happen? I don't know if this is the first time our user has
email this recipient or not, but we've never had the error before! Would
changing the hostname from isasvr to mx.domain.com fix this? Would doing so
break anything else (We have an internal exchange 2003 server that relays
through this SMTP relay)?
Thanks in advance,
Ben
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