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List:       postfix-users
Subject:    Re: single instance multi-tenant service
From:       Viktor Dukhovni <postfix-users () dukhovni ! org>
Date:       2019-11-27 19:36:59
Message-ID: CCFCE422-8867-4357-8EF3-823BB9B24EE8 () dukhovni ! org
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> On Nov 27, 2019, at 1:35 PM, Wietse Venema <wietse@porcupine.org> wrote:
> 
>> Would adding a new tenant to the system (i.e. a new route in Postfix)
>> require a restart, interrupting mail flow for existing tenants?
> 
> Service disruption is unnecessary. "postfix reload" (not stop+start)
> should suffice.

When lists of relay, virtual, ... domains etc., are stored in tables
rather than listed verbatim in main.cf, even a reload is not generally
required, but may in some cases speed up the visibility of the new
data.

The main difficulty with multi-tenant configurations is hosting of
mailing lists (mailman and the like), this often requires per-tenant
user accounts which own the respective alias files, run maintenance
scripts, ...

If you're providing shared outbound mail, its "reputation" can be
tainted by just a single user who buys a list to market to, or
whose username/password is compromised.

-- 
	Viktor.

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