gnus: Sending or Not Sending

 
 6.8.3 Sending or Not Sending
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 Well, assuming you’ve read all of the above, here are two final notes on
 mail sending with ‘nndiary’:
 
    • ‘nndiary’ is a _real_ mail back end.  You really send real diary
      messages for real.  This means for instance that you can give
      appointments to anybody (provided they use Gnus and ‘nndiary’) by
      sending the diary message to them as well.
    • However, since ‘nndiary’ also has a ‘request-post’ method, you can
      also use ‘C-u a’ instead of ‘C-u m’ on a diary group and the
      message won’t actually be sent; just stored locally in the group.
      This comes in very handy for private appointments.