permissions

"Gabor Z. Papp" <[email protected]>
Newsgroups gmane.network.sn
Organization gzp
Message-ID <[email protected]>
Jul  9 23:23:59 gabriel nntp: ./list.seanet/.outgoing: /bin/sendmail: Permission denied
Jul  9 23:23:59 gabriel nntp: /home/news/sn/bin/POST: line 83:  3517 Done
             { echo "X-sn-Newsgroups: $postable"; [ "x$VERIFIED_SENDER" = x ] || echo "Sender: $VERIFIED_SENDER"; cat; }
Jul  9 23:23:59 gabriel nntp:       3518 Segmentation fault      | snsend -v
Jul  9 23:23:59 gabriel nntp: snntpd[3510]:POST:Unable to post
Jul  9 23:23:59 gabriel nntp: snntpd[3510]:do_post:POST died with 9

sendmail looks like root.mail mode 750
sn runs under group news, and news user is part of group mail.
As user news I can use sendmail.
So where is the error, and why sn can't run sendmail?
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