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Re: Existing email address meta-syntax standards, especially GSTN

2008-05-22 18:47:11

On May 22, 2008, at 2:57 PM, John Levine wrote:

BATV could then rely upon the use of the "-" in Verp to ensure differentiation.

No such luck. Existing VERP implementations use all sorts of delimiters, and you can't count on finding a hyphen.

It still seems placing more restrictions on the BATV tag character set would be a safer choice. In addition, perhaps the tag could be bracketed by "=" to better ensure uniqueness as well.

=batv1=kiiihhhh=local-part(_at_)dom(_dot_) (iii could be an index maintained per local-part or the entire domain)

The danger seem to be when services within a domain uses something like VERP which might become confused with an invalid BATV tag. The concept of having MUAs apply their own BATV tag requires outbound MTAs to be robust in recognizing these tags.