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> 1) what will happend with an E-mails if RELAY02 will not be available for a
> few hours ? In my understanding Postfix will put all E-mails to the
> deffered queue and it will store messages there till RELAY02 will not be
> available again.
> Is this correct ?
This is required by the SMTP protocol, see RFC 5321.
> 2) If Outage will take few hours (till one day).
> How much disk space do I need to prepare for all messages ? Is there any
> parameter in Postfix which limiting number of messages in the deffered
> queue ? What kind of message will be send to the client if deffered queue
> will be full ?
Perhaps a surprise: Postfix stops accepting mail when the queue is
full (queue_minfree parameter). As required by the SMTP protocol,
the up-stream SMTP client retries deliveries until Postfix accepts
mail again.
> How to properly plan disk space and queues for high loaded systems.
With multiplication and addition.
Wietse
