whats with the weird tag on this thread?
%20 is an escaped form of the space character.  Some mail
programs escape all control characters, or even anything
like {} ~.

On Tue, 9 Apr 2019, Peter Coghlan via cctalk wrote:
Yes but "%20" is the form of escape intended for use with http, not for email.
For email, it should be "=20" and if such escaped characters are included in a
subject line, this is supposed to be indicated by the subject field starting
with a sequence like "=?charset?Q?" to flag the use of what is called quoted
printable encoding.

It's due to the use of "standardized" character encoding.
ASCII, UTF-8, Unicode, . . . "Standards are wonderful; everybody can have a unique one of their own." I asked one of my classes to look up what "standard" means - one student came up with a definitive answer: apparently it is a flag on a tall pole. Any definitions having to do with conformation between systems are now deprecated.


You mix that with an HTML browser program attempting to be an email client, . . .

This particular sort of mess often occurs when somebody uses a character that isn't part of the basic set. The subject line mentioned half inch. SOME program "did a favor" for its user, and changed "1 / 2" to a single character for one half. And/or took the symmetrical character abreviation for inch, and changed that, since "OBVIOUSLY, left, right, and center double quote characters are not the same".

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