Re: [exim] Callouts, NULL DSN

> You're probably doing postmaster or header_sender callouts with a
> non-empty reverse-path, which is unfortunately Exim's default. Use the
> use_sender option on your callouts to make your mail server behave more
> sanely.

So why all the warnings in the docs about not using an address in the DSN
and talk about callback loops?

I noticed that one version of Exim switched to a default of (use sender,
postmaster?) and the next version switches back to null.

Steve