Tony Finch wrote:
On Tue, 4 Apr 2006, W B Hacker wrote:
require verify = recipient/callout
Well - yes, if on the same server ....
No, callouts work across servers. We use this on the MXs in Cambridge to
verify addresses in departments such as the Computer Lab that run their
own email servers. It also works for organizations such as the University
Press for which we act as a secondary MX.
Tony.
Surely they are *intended* to do so, and certainly may do if all
is well. Better than 'ident' for sure...
But I am sure you know at least as well as I how unpredictable
they can be in the smtp world-at-large - especially given the
mix of brazillions of minor players with who-knows-how config
and certain 'major' ISP's who would just as soon blacklist those
who query their servers regularly, then abort w/o traffic - even
on sender verification.
I'd have to be convinced that off-box pre-delivery recipient
callouts earned their overhead vs simple 'send-it-and-see'.
On-box or within-known-network / affinity group, where you can
talk to the folks running 'em is a whole 'nuther critter.
In Marc's case, I remain baffled as to where checking for an
address that was of his own 'generated ..' and '.. arbitrary'
devising is needed / useful instead of a more direct method.
Bill
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