On Tue, 2 Apr 2002, Ralf Hildebrandt wrote:

> On Tue, Apr 02, 2002 at 03:23:27PM -0300, jcarminatipluspetrol.com.ar wrote:
>
> > I'll investigate how much overhead should be expected from a .zip file (I'd
> > like to imagine that should be < 5% (?) ).
>
> I always thought to store the info 7bit clean, one would need 8/7
> times more space.
>

Not all of the 7 bit ASCII characters are available for transmitting
message body content. It is easier to use a 6 bit encoding than a 6 and
fraction bit encoding.

The problem characters are at least bare CR, bare LF, trailing white space
before CRLF (SMTP is free to pad lines with white space). NUL and
other control characters should not be used to improve interoperability
with legacy environments. The definition of encoding also needs to be
compact. The MIME base64 character set is chosen very carefully to for
example optimize interoperability with EBCDIC environments and to avoid
other subtle problems. The details are in the RFC.

-- 
	Viktor.
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