set executable permission to sendmail

build.sh

@@ -104,6 +104,8 @@ mkdir /var/empty
 
 chmod 755 /usr/local/bin/apply-forced-params
 
+chmod 755 /usr/sbin/sendmail
+
 # Install python-mailman-api.
 (cd /tmp ; pip install \
     'git+https://git.autistici.org/ai3/tools/python-mailman-api.git#egg=mailman-api')