David Woodhouse wrote:
On Sun, 2005-08-21 at 21:10 -0700, Steve Brown wrote:
So why all the warnings in the docs about not using an address in the DSN
and talk about callback loops?
That warning is appropriate for normal sender verification callouts. Not
for postmaster or header_sender callouts, which should have a non-empty
local sender (which doesn't trigger callouts of its own) -- or for
recipient callouts, which should use the same reverse-path as the mail
causing the callout.
So, I'm confused. Surely the avoidance of loops always requires callout
to use a null sender, and postmaster and header-sender callouts are
in contravention of that? I'd say that the warning is *always*
appropriate. Your "doesn't trigger callouts of its own" is not
under your control; it's the remote end which might be deciding to
make yet another callout.
- Jeremy
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