[Dovecot] rule of thumb for indexing overhead

[Tom Bombadil]

> 
>> of indexing during delivery are negligible for us in general and
>> potentially negative in some scenarios (mass mail to many/all users).
> 
> Is this negative hypothetical or have you actually seen load spikes in situations like this?

I actually did see that.
In the case of exim, for each piece of mail going to the mailbox, one
exim process is spawned, and this exim delivery process spawns the
dovecot's LDA. The load pretty much doubles.

But the number of exim delivery processes can be limited in exim's
config file.

Cheers,
g.