[Exim] verify=sender/callout performance?

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Author: John Dalbec
Date:  
To: Exim-users
Subject: [Exim] verify=sender/callout performance?
The documentation mentions that verify=sender/callout is a performance
hit. In Exim 4.14, how much extra load can I expect? Some spammers use
randomized addresses so I guess caching won't work for them.
Thanks,
John Dalbec