> Is it possible to use an object storage system (like aws's S3) to store 
> message files? if this can be implemented we may have a more persistent 
> storage for email. AFAIK aws's S3 has three replicas for each file in their 
> system by default.


At that scale emails are usually delivered via lmtp so that postfix does not 
store messages directly.
Dovecot has obox, which may not be availble in community edition.

https://doc.dovecot.org/configuration_manual/mail_location/obox/

Best regards
Gerald
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