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.
References RFC 2821 is available at ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt.
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