Thanks Craig for your comments. I've got my sendmail on CentOS 6 working with: # yum erase postfix # yum install sendmail sendmail-cf # mkdir /etc/mail/auth # chmod 700 /etc/mail/auth # mkdir /etc/mail/certs # chmod 700 /etc/mail/certs Create the file /etc/mail/auth/client-info: AuthInfo:smtp.gmail.com "U:smmsp" "I:Alexander.Farber" "P:XXX" "M:PLAIN" AuthInfo:smtp.gmail.com:587 "U:smmsp" "I:Alexander.Farber" "P:XXX" "M:PLAIN" # cd /etc/mail/auth # makemap -r hash client-info.db < client-info # cd /etc/mail/certs # openssl dsaparam 1024 -out dsa1024.pem # openssl req -x509 -nodes -days 3650 -newkey dsa:dsa1024.pem -out /etc/mail/certs/mycert.pem -keyout /etc/mail/certs/mykey.pem # ln -s /etc/mail/certs/mycert.pem /etc/mail/certs/CAcert.pem # rm dsa1024.pem # chmod 400 *.pem Added to file /etc/mail/sendmail.mc: define(`SMART_HOST', `smtp.gmail.com')dnl define(`CERT_DIR', `MAIL_SETTINGS_DIR`'certs') define(`confCACERT_PATH', `CERT_DIR') define(`confCACERT', `CERT_DIR/CAcert.pem') define(`confSERVER_CERT', `CERT_DIR/mycert.pem') define(`confSERVER_KEY', `CERT_DIR/mykey.pem') define(`confCLIENT_CERT', `CERT_DIR/mycert.pem') define(`confCLIENT_KEY', `CERT_DIR/mykey.pem') Then "make" in /etc/mail and "service sendmail restart" I understand your point that it is stupid of me (and probably many other users) to ask same questions again and again, without really understanding what's going on :-) The file /etc/pki/tls/misc/CA.pl on CentOS is cubersome to understand though. I tried creating ./CA.pl -newca etc. but then I wanted to start over because of an invalid input made by myself and I didn't even know how. I know CA.pl keeps a text file somewhere where it stores increasing integer numbers... but couldn't find it Regards Alex _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos