Underscore in Exchange server name

I have an Exchange server 5.5 that I send mail out to the Internet, will the underscore cause any problems with older mail systems not being bale to receive mail from me and why?  I know underscores are not RFC compliant per http://www.faqs.org/rfcs/rfc1035.html, but I have sent mail out like this for years with no problem until now someone says they have a Groupwise mail server not receiving mail from me due to "a rejection due to validation failure."  

Although I know it is not the preferred naming convention for a mail server, will it in all intents and purposes cause mail to not be received by certain mail servers?

thanks.
ohmadminAsked:
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SembeeConnect With a Mentor Commented:
That depends if it is sending that name out to the Internet.

If the machine is known to the Internet as mail.domain.com then you should be fine.
If the machine is known to the Internet as our_mail_server.domain.com then you should change it. I cannot remember if you can a different name in Exchange 5.5 for FQDN and server name. I know you can in Exchange 200x.

The validation failure could be reverse lookup problem. More sites and servers are starting to use this to validate that you are who you say you are. You would need to speak to your ISP to resolve that problem.

Simon.
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