Subj : Re: Directly include binary data in messages
To   : Tim Schattkowsky
From : Rob Swindell
Date : Sat Feb 12 2022 12:10:52

  Re: Re: Directly include binary data in messages
  By: Tim Schattkowsky to Rob Swindell on Sat Feb 12 2022 03:09 pm

 >  RS> What purpose is the filename?
 >
 > The same as in MIME and further, if no content-type mechanism is added. In
 > that case, the file extensions may come into play for identifying the file
 > type.

MIME includes a standardized type value that is non-ambiguous for a reason: filenames are not the best methods for determining a file's content type. Is it .jpeg, .JPEG, .jpg, .jpe, .jfif, or .jif? All of these are valid JPEG file extensions, but there's only *one* corresponding MIME-type (aka Internet media type): image/jpeg.
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