Invalid Domain Name

A customer would like to use a service called Zywave to send out newsletters to his clients.  He is also using MS Office 365.  Integratio of the Zywave application with his Outlook 365 email requires that several changes be made to his DNS records.  The CNAME that The Zywave folks specify is OK, but the TXT record returns the error shown in the attachment.  Apparently, Outlook online believes that the hostname should not have an underscaroe as its first character.  The Zywave help desk insists that their specification is correct.

What am I missing here?  Is Outlook enforcing something that is not commonly enforced?  Or, did Zywave send us an incorrect hostname?
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rhaveyAsked:
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Dave BaldwinFixer of ProblemsCommented:
You're missing an attachment at least.
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Dave BaldwinFixer of ProblemsCommented:
From http://tools.ietf.org/html/rfc1034 and http://tools.ietf.org/html/rfc1035 ...
They must start with a letter, end with a letter or digit, and have as interior
characters only letters, digits, and hyphen.
That says that the underscore isn't legal anywhere in the name.

Also http://en.wikipedia.org/wiki/Domain_Name_System#Domain_name_space
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rhaveyAuthor Commented:
Thank you.  You are telling me what I thought was true.

I thought that I had attached the Word document with my original post.

The Excel document is what we got from Zywave to enter into the DNS record.  Am I misinterpreting something?
DNS-Record-Problem.doc
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rhaveyAuthor Commented:
This is the Excel file with the changes.

I a m stumbling because I usually do not have attachments.  I think I am catching on.
First-Choice-Insurance-Agency-Zy.xls
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Adam BrownSr Solutions ArchitectCommented:
As was mentioned, underscores are not allowed in TXT records. They are, however, used in SRV records, but _domainkey isn't a typical SRV locator record. Perhaps _domainkey is a placeholder for something else? I would contact Zywave to get some clarification.
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Dave BaldwinFixer of ProblemsCommented:
I would tell Zywave that nobody else agrees with them.
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rhaveyAuthor Commented:
We are checking into the placeholder theory.  If it is a placeholder, it would have been nice if they had told us what goes in there.

I will let you know when I get an answer from Zywave.
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rhaveyAuthor Commented:
I apo;ogize for the delay.  We did a lot of back and forth with Zywave.  It turns out that RFC 1035 was superceded by RFC 2181, but Microsoft did not implement the RFC 2181 changes in Outlook 365.  It took a little digging on Microsoft's forums to find that fact.  RFC 2181 allows things that RFC 1035 does not.

The answer was to abandon Exchange 365 in favor of vanilla POP accounts.
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rhaveyAuthor Commented:
The problem was solved by not using Outlook 365.
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