smtpmail: Queued delivery

 
 5 Queued delivery
 *****************
 
 If you connect to the internet via a dialup connection, or for some
 other reason don’t have permanent internet connection, sending mail will
 fail when you are not connected.  The SMTP library implements queued
 delivery, and the following variable control its behavior.
 
 ‘smtpmail-queue-mail’
      The variable ‘smtpmail-queue-mail’ controls whether a simple off
      line mail sender is active.  This variable is a boolean, and
      defaults to ‘nil’ (disabled).  If this is non-‘nil’, mail is not
      sent immediately but rather queued in the directory
      ‘smtpmail-queue-dir’ and can be later sent manually by invoking
      ‘smtpmail-send-queued-mail’ (typically when you connect to the
      internet).
 
 ‘smtpmail-queue-dir’
      The variable ‘smtpmail-queue-dir’ specifies the name of the
      directory to hold queued messages.  It defaults to
      ‘~/Mail/queued-mail/’.
 
    The function ‘smtpmail-send-queued-mail’ can be used to send any
 queued mail when ‘smtpmail-queue-mail’ is enabled.  It is typically
 invoked interactively with ‘M-x smtpmail-send-queued-mail RET’ when you
 are connected to the internet.