UwUMail Server 0.28.1

Added

• Refused mail can be marked Fixed (Server → Queue → Refused mail): it goes back into the
  queue, together with every other refusal with the same cause (for Microsoft the same block
  list code such as S3150 across hotmail.com, outlook.com and live.com, otherwise the same reply
  code to the same domain). For this, a refused mail from one of the server's own accounts keeps
  its message (up to 10 MB) for the 30 days it stays on the list; bounces and forwards keep
  nothing. Mail of a sender who is suspended, in the trash or deleted stays on the list. Entries
  from before this version have no copy and are only taken off the list. See
  docs/microsoft.md.