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(emacs)Mail Sending

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Mail Sending
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   Mail mode has two commands for sending the message you have been
editing:

`C-c C-s'
     Send the message, and leave the mail buffer selected (`mail-send').

`C-c C-c'
     Send the message, and select some other buffer
     (`mail-send-and-exit').

   `C-c C-s' (`mail-send') sends the message and marks the mail buffer
unmodified, but leaves that buffer selected so that you can modify the
message (perhaps with new recipients) and send it again.  `C-c C-c'
(`mail-send-and-exit') sends and then deletes the window or switches to
another buffer.  It puts the mail buffer at the lowest priority for
reselection by default, since you are finished with using it.  This is
the usual way to send the message.

   In a file-visiting buffer, sending the message does not clear the
modified flag, because only saving the file should do that.  As a
result, you don't get a warning if you try to send the same message
twice.

   When you send a message that contains non-ASCII characters, they need
to be encoded with a coding system (Note: Coding Systems).  Usually
the coding system is specified automatically by your chosen language
environment (Note: Language Environments).  You can explicitly specify
the coding system for outgoing mail by setting the variable
`sendmail-coding-system' (Note: Recognize Coding).

   If the coding system thus determined does not handle the characters
in a particular message, Emacs asks you to select the coding system to
use, showing a list of possible coding systems.