* Gino Ferguson via Postfix-users <postfix-users@postfix.org>:

> Can you explain me the practical difference between relay and smtp delivery 
> on a relay server? 

The "relay" and "smtp" service are both "smtp" services.

But: If you seperated "relay" from "smtp" you can do stuff like:

defer_transports = relay

without affecting mail to other destinations.

Also, the qmgr is assigning delivery slots to services in a
round-robin fashion, so having one for "relay" and one for "smtp"
ensures fairness for relaying duties vs. delivery to external sites.

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | https://www.charite.de
            
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