Re: why does smtpserver restrict quote in argument to router for verification

[Nicholas_Briggs.PARC@xerox.com]

It's fine as far as RFC821 goes too.  Besides, even if you did escape the
quote, the code in the smtpserver isn't looking for that -- it's just checking
for the presence of a single quote anywhere in the address.

Perhaps it was intended to be a reverse-quote?  Perhaps it is trying to guard
against something like
	MAIL FROM:<`/bin/halt`>
managing to get the string executed as it is "read" by some part of the router
zsh code?

Here's the BNF that applies to the address:

<reverse-path> ::= <path>
<path> ::= "<" [ <a-d-l> ":" ] <mailbox> ">"
<mailbox> ::= <local-part> "@" <domain>
<local-part> ::= <dot-string> | <quoted-string>
<dot-string> ::= <string> | <string> "." <dot-string>
<string> ::= <char> | <char> <string>
<char> ::= <c> | "\" <x>
<c> ::= any one of the 128 ASCII characters, but not any
          <special> or <SP>
<special> ::= "<" | ">" | "(" | ")" | "[" | "]" | "\" | "."
                      | "," | ";" | ":" | "@"  """ | the control
                      characters (ASCII codes 0 through 31 inclusive and
                      127)

Notice that <special> does NOT include a single quote mark, therefore there is
no requirement to escape the quote mark in Shawn_O'Malley@mc.xerox.com.

					\nick