Premium AntiSpam rejects messages from mail servers or clients with a "_" (underscore) in the host name
| Article:TECH89218 | | | Created: 2008-01-24 | | | Updated: 2013-01-04 | | | Article URL http://www.symantec.com/docs/TECH89218 |
Problem
Messages being rejected with a "501: Invalid Domain"
Symptoms
Some messages are getting rejected from Symantec Mail Securty for Domino with Premium AntiSpam enabled, without leaving behind any log.
Cause
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.
Solution
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:
PASRelaxRFC=1
References
RFC 2821 is available at ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt.
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Legacy ID
2008032408351654
Article URL http://www.symantec.com/docs/TECH89218
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