Messages being rejected with a "501: Invalid Domain"
Some messages are getting rejected from Symantec Mail Securty for Domino with Premium AntiSpam enabled, without leaving behind any log.
Section 4.1.2 of RFC 2821 (ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt) states the underscore is not permited in domain labels for SMTP clients or servers.
Change the host name to no longer include an underscore.
RFC 2821 is available at ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt.
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