I am currently using verify = sender without the /callout option because the manual
says "it can add a lot of resource usage to the cost of verifying an address".
I am looking to see if most people have the callout switched on as it seems to me
that it would screen out a significant proportion of spam, saving the cost of
scanning.
Any advice?
Phil.
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Phil Chambers (postmaster@???)
University of Exeter
