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RFC2821bis-01 Issue 3: EHLO parameter

2007-03-22 20:20:10

Section 4.1.4, paragraph 6 (starting "An SMTP server MAY verify...") discusses the use and validation of the domain name value in EHLO or HELO. It has been suggested that this discussion be strengthened by a discussion of the conditions under which rejection for a bad EHLO argument might be permitted. That discussion would be explicitly tied to the material about rejections in Section 7 (Security Considerations).

At least one argument against a change is that it would be hard to write the needed text without promoting future arguments about situations that are not covered. Right now, the model is to describe one specific reason why a message cannot be rejected based on an EHLO parameter, then essentially invoke the rule that a server can reject a message for virtually any reason, just because it isn't obligated to accept and process mail.

Question: Is a change needed here, or is the text ok as is?