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Pretty sure you can't do anything when you're not connected to the internet.



A connection timeout is a soft bounce.

https://tools.ietf.org/html/rfc5321#section-4.5.4.1

   The sender MUST delay retrying a particular destination after one
   attempt has failed.  In general, the retry interval SHOULD be at
   least 30 minutes; however, more sophisticated and variable strategies
   will be beneficial when the SMTP client can determine the reason for
   non-delivery.

   Retries continue until the message is transmitted or the sender gives
   up; the give-up time generally needs to be at least 4-5 days.  It MAY
   be appropriate to set a shorter maximum number of retries for non-
   delivery notifications and equivalent error messages than for
   standard messages.  The parameters to the retry algorithm MUST be
   configurable.


That's why sending mta's should resend. Think sendmail does this every few hours or so




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