Premium AntiSpam rejects messages from mail servers or clients with a "_" (underscore) in the host name
|Article:TECH89218|||||Created: 2008-01-24|||||Updated: 2013-10-28|||||Article URL http://www.symantec.com/docs/TECH89218|
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.
- Add the following line in the notes.ini file to relax the Premium AntiSpam RCF compliance enforcement:
RFC 2821 is available at ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt.
Article URL http://www.symantec.com/docs/TECH89218