This is a simple SMTP question but I'm not sure if it's defined the same for 
all SMTP servers.  

Let's say I have a system with a dynamically allocated IP address and I also
have dynamic DNS set up to point foo.com at it.  Now a record always exists 
for foo.com but the system may not always be online because I may bring the
system down for maintenance.  If mail is sent at this time it will wait in
the queue - but does it wait until the IP address comes back up or until foo.com
comes back up?  The reason I ask is that if I then bring the machine back up
again it may not get the same address but whatever it gets the DNS server will
be updated with the new IP.

Any pointers would be useful.  Thanks

-- 
  Matthew Harrell                          Bill Gates is only a white Persian
  Simulation Technology Division, SAIC      cat and a monocle away from being
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