
Signature
Andrew Starr
eMailman(r): http://www.emailman.com
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>I
>would be curious to know if underscored usernames, or portions thereof
>(not one underscore, but other letters/numbers/etc. underscored
>themselves) are legit.
They would be 8-bit characters, wouldn't they?
Even now, are all mail gateways expected to pass high bit characters? In
the body of a mail, they would be encoded as 7 bit for transmission,
wouldn't they? But I wouldn't have thought that the address would be
encoded.
I'm speaking from ignorance; I'd be curious to know about the reality.

Signature
Peter
Kathy Morgan - 24 Apr 2004 21:54 GMT
> >I
> >would be curious to know if underscored usernames, or portions thereof
[quoted text clipped - 7 lines]
> wouldn't they? But I wouldn't have thought that the address would be
> encoded.
Here is what RFC 822 says:
3.1.2. STRUCTURE OF HEADER FIELDS
Once a field has been unfolded, it may be viewed as being composed of a
field-name followed by a colon (":"), followed by a field-body, and
terminated by a carriage-return/line-feed. The field-name must be
composed of printable ASCII characters (i.e., characters that have
values between 33. and 126., decimal, except colon). The field-body may
be composed of any ASCII characters, except CR or LF. (While CR and/or
LF may be present in the actual text, they are removed by the action of
unfolding the field.)
Underscored letters are not included in the ASCII characters, so I think
many (most?) mail software would not handled underscored characters in
the headers gracefully.
Gunther, could it be a mistake on someone's part to show the letter as
underscored? Perhaps it is supposed to be preceded by the underscore,
which is an ASCII character, and I see many email addresses which
include an underscore between letters.

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Kathy