The document describes how to make sendmail's uucp mailer support UUCP_MAILER_USER. It allows to specify user and group used by sendmail to execute uux program.
It should allow installing uux without set uucp uid.
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define(`UUCP_MAILER_USER',`uucp:uucp')dnl MAILER(`uucp')
Apply the patch (the gpg signature) - in main directory of sendmail distribtion execute
patch -p1 < uucp-user.patch
Recompile sendmail.cf (no need for sendmail binary recompilation)