Hi Thomas,

On Sun, 25 Nov 2018 04:12:10 +0100 Thomas Bohl wrote:
> > smtp2 doesn't deliver the mail to an IMAP mail storage daemon.
> > 
> > Instead, it spools it and waits....
> 
> But why? Just deliver it and be done. Can't see many drawbacks in
> that.
> 

Backup MX servers don't have any mail storage, nor IMAP/POP daemon.

They are another hop along the delivery path to the primary MX servers.



Backup MX machines are not the message's final destination;-

Pretend you are going to the world's biggest party, which is held every
New Year's Eve in Edinburgh, so you board an aeroplane to Edinburgh.

But the snow hits Scotland, so your aeroplane lands in London. England
is not your final destination. It is a backup airport in a different
country. You have not travelled to the party capital. So you wait/spool
in London until Edinburgh airport is receiving traffic. Then then you
get the next flight to your final destination & Hogmanay for 3 days.


Cheers,
-- 
Craig Skinner | http://linkd.in/yGqkv7

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