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Re: [StrongED] Re: A question then...



On 14 Nov 2017  Alan Adams <alan@xxxxxxxxxxxxxxxx> wrote:

> In message <569ad4c1b2dave@xxxxxxxxxxxxx>
>           Dave Symes <dave@xxxxxxxxxxxxx> wrote:

> <snip>

>> Another question.

>> Any idea why the sig on all mails from this list have --=20 just before
>> the signature lines. (hyphen hyphen=20)
>> Thus...

>> --=20
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> In the early days of electronic communication the links between
> systems were over modems. Modems transmitted data as 7 data bits abnd
> a partiy bit, used for error checking, so only 7-bit data could be
> transmitted. In addition various control charaers were used for link
> management. This meant that the "unprintable" characters could not be
> sent unchanged.

> Various methods were used for this. Today the most frequently used is
> Base64, but an early one still seen is "quoted printable". This marks
> each unprintable character with an = sign, followed by the two-digit
> hex ASCII code for it. The printable characters start at 21 hex, a !
> character, and end at 7E, the ~ character.

> For some reason space - 20hex - isn't regarded as printable, so
> appears as =20, 20hex being its ASCII code. It's frequently seen at
> the end of lines, as in the example shown in your question.

> Why it is displayed is another question. Usually the content header
> within the message indicated the encoding system used, and the
> receiving mail system translates the codes back to their 8-bit forms.
> If the header is wrong or missing then the encoded message is
> displayed.

I think it must be a difference between Pluto (Dave) and MPro (me) as 
I don't get the --=20 here.

Best wishes,

Peter.


-- 
Peter Young (zfc Pt) and family
Prestbury, Cheltenham, Glos. GL52, England
http://pnyoung.orpheusweb.co.uk
pnyoung@xxxxxxxxxxxx

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