NIS users unknown for procmail?

Hello

Could someone tell me if procmail (v3.13.1) can recognize NIS users?

$ ypcat passwd|grep koltl
koltl:...... 

OK (NIS user entries are in /etc/passwd.nis)

$ procmail -d koltl
dfdfh
dfh
dfh
^D
procmail: Unknown user "koltl"

First I tried to replace mail with procmail in sendmail.cf, but every
local recipient proved to be "Unknown user" so I tried it simply this way.

$ cat /etc/passwd|grep guest1
guest1:...

$ procmail -d guest1
sargrgt
re
gre
^D

And the local user receives the mail.

(Machine: Origin200, IRIX 6.4)

Please help, thanks in advance.

Peter