Yes, the recipients are all non-local.
I was focused on preventing useless bounce messages, but now I think I take
your point: Calling the ACL on all mail prevents bounces, correct?
As to when this is called, I would put it on our egress node, which only
has acl_check_rcpt. I planned to put it after that. So more like this?
acl_check_vrfy:
deny
!verify = recipient/callout
I didn't put a time-out on it when I was just doing senderless mail--that's
an unusual occurrence for us, so I wasn't as worried about the time it
takes--but perhaps I should.
On Fri, Jan 20, 2023 at 1:15 PM Jeremy Harris via Exim-users <
exim-users@exim.org> wrote:
> On 20/01/2023 18:18, Johnnie W Adams via Exim-users wrote:
> > I've been doing some research on recipient verification to
> eliminate
> > bounces, and am wondering if it's as simple something like this at the
> end
> > of my ACL list:
> >
> > acl_check_vrfy:
> >
> > deny
> >
> > senders = ''
> >
> > !verify = recipient/callout
> >
> > Surely it's not that simple, but I'm at a loss as to what else is
> > needed
>
> You didn't say when you'd be calling this ACL, nor why you'd
> only be verifying bounces. Not generating bounces yourself
> is also worthy, which means validating recipients of nonbounce
> messages; using the routers and possibly transports to do the
> validation (which is what "verify" does) is one way.
>
> I assume the recipients you are validating are non-local
> to this box, since you specify callout. But you could be
> confused about the intent of recipient verification.
>
> --
> Cheers,
> Jeremy
>
>
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