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I want sendmail to take all outgoing messages from user32 to be from "John Smith" with email address "". How can I go about that without using the -f and -F sendmail options every time?

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If understand you correctly, you can do so by modifying ruleset 0 (or ruleset 1) to rewrite the address:

R$* < @ $=w . > $*       jsmith_rocks < @ . > $3
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