[Exim] Address Verification - Sender/Callout

> > verify = sender/callout=15s/no_details
>
>Yes, you can do this, you also can use the syntax described in NewStuff
>verify = sender/callout=15s,no_details,more_options
>
> > I don't (yet) fully understand the use of these along with the
> > "callout_defer_ok" and "defer_ok" switches..<?>
>
>defer_ok will return OK, even if one of your routers defer for the given
>address (dns issues/database problems)
>
>callout_defer_ok will return ok, even if the verification fails with a
>temporary-error, while callout

Thanks Nico..! Since it's a production box with some 300+ users, I feel
better knowing I won't hose their services when I go tweaking.. Thanks
again for your time and helpful information..! I'll give it a spin..

Cheers!
Craig