Commits on Sep 15, 2023

1. Set email charset as utf-8 rather than utf8 …

   As stated in [1], the charset parameter can be set to "any character
   encoding that has been registered with IANA". A full list of these
   is available in [2].
   
   Notably missing from that list is the `utf8` value that was being used
   for email charsets. The strictly more correct name is `utf-8` (or
   `UTF-8`, since these names are case-insensitive).
   
   The popularity of UTF-8 has meant that aliases like `utf8` are supported
   by a number of email servers. Unfortunately, not all are as
   accommodating (see for example [3]), so a more standard name means Synapse
   can be used even with the more opinionated servers.
   
   [1]: https://www.w3.org/International/articles/http-charset/index
   [2]: http://www.iana.org/assignments/character-sets/character-sets.xhtml
   [3]: emersion/hydroxide#165
   
   Signed-off-by: José Joaquín Atria <jjatria@gmail.com>

   

   jjatria committed Sep 15, 2023
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