Jonathan K. Tullett:
> On 21 December 2014 at 13:56, Wietse Venema <wie...@porcupine.org> wrote:
> >
> > > Since the end of October, that number has dropped to 16 a second
> > > on a good day.
> >
> > What has changed? Obiously, Postfix didn't change, and replacing
> > Postfix isn't going to make a difference.
> >
>
> I don't have access to any logs from that period, so I don't know what
> changed that week (though it's obvious something did.). I have come into
> this blind and am working backward.
If you want a random guess, the authorized_submit_users feature in
Postfix sendmail and postdrop invokes getpwuid which in the worst
case requires a sequential scan over the entire password file.
If you have a hashed password file or not then that makes a huge
difference.
Wietse
