What does "Convert ... upon sending" mean?

Mon Apr 22 05:18:44 UTC 2019

On 2019-04-21, at 19:53:04, Cameron Simpson wrote:
>> ...
>> and the content is definitely not Cyrillic:
>>       0  16  32  48  64  80  96 112 128 144 160 176 192 208 224 240
>>       0  10  20  30  40  50  60  70  80  90  a0  b0  c0  d0  e0  f0
>> 0  0                       &   -   ï¿½   ï¿½   ï¿½   ï¿½   ï¿½   {   }   \   0
>> 1  1                   ï¿½   ï¿½   /   ï¿½   a   j   ~   ï¿½   A   J      1
>> 2  2                   ï¿½   ï¿½   ï¿½   ï¿½   b   k   s   ï¿½   B   K   S   2
>> 3  3                   ï¿½   ï¿½   ï¿½   ï¿½   c   l   t   ï¿½   C   L   T   3
> 
> How are those listings obtained? Might the thing presenting those listings be interpreting the iso8859-5 data as the local character encoding and thus misrendering?
>  
They're the Unicode "Replacement Character":
    https://www.fileformat.info/info/unicode/char/fffd/index.htm
    HTML Entity (hex)	&#xfffd;
    UTF-8 (hex)	0xEF 0xBF 0xBD (efbfbd)

Thanks,
gil