"Alan J. Flavell" <flavell@???> wrote:
>On Fri, 21 Mar 2003, John Dalbec wrote:
>
>> The documentation mentions that verify=sender/callout is a
>> performance hit.
>
>Sure - you've got to do practically all the work of setting up a
>fresh mail transaction.
Unless there's a cache hit.
>And many an MTA will do no more than confirm an address as
>syntactically correct, irrespective of whether it really exists,
>which makes the callout a waste of time and effort.
That's what verify = sender/callout,random is for.
>BTW, callout can also block mail from envelope senders whose mail
>domain never responds.
If you are inclined towards charity in this case then use
verify = sender/callout,defer_ok
Tony.
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