FWIW
The "compose" dialogs on Microsoft Outlook 2010, Yahoo! Mail, Live.com,
and Gmail do not allow dotless domains. Yahoo and Live.com reject the
address as malformed; Outlook tries to look it up in the local address
book; Gmail gives an error on send.
Thunderbird 2.0 to my employer's Exchange server (over SMTP) worked fine
-- and then the message got rejected by the corporate firewall as
"invalid domain."
<csg>
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