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How to use confUSERDB_SPEC feature of sendmail?

Solution Unverified - Updated 2014-07-01T01:17:48+00:00 -

Issue

How to configure sendmail to rewrite sender address?
How to configure sendmail to use confUSERDB_SPEC option?

Environment

Red Hat Enterprise Linux 4
sendmail-8.13.1-6.el4

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