Run sa-exim as a special user

Hallo,

I use exim-4.30-3, spamassassin 2.61-2 and sa-exim 3.1-2 from a debian
package.
Spamassassin and exim work good, but bayes does not work good.

I have a spam mail. 
If I check is mail with "spamc -c < spam.txt", then the result is:
0.5/3.0
If I check is mail with "spamc -c -u mail < spam.txt", then the result
is: 5.4/3.0 ... [score 1.0000]
Is is correct, because I say spamassassin to use a system wide bayes
path. In /etc/spamassassin/local.cf
"bayes_path /var/mail/.spamassassin/bayes"

No my problem. How can I invoke sa-exim with the "-u mail" flag or is
there a other way to do this?

Thanks
Martin

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