[Dovecot] Override config in deliver command line

[Andrew Schulman]

> In dovecot deliver LDA, is there a way to override some configuration
> settings for particular users?

No, I don't believe there is a way to do that at present.  And yes, it would be
a very useful and probably simple feature to add.  I'll add my voice to the
feature request for this.

I also needed to do this.  I ended up working around it by writing a script to
create a new temporary config file, with the settings replaced.  It's not
pretty, but it works.

Andrew.