syslog-ng, Error parsing destination, destination plugin smtp not found in

[Stefan Fuhrmann <stefan@xxxxxxxxxxxxxxxxxxxx>]

Hello all,

I want to send mail alert, when messages comes in via UDP.
 But having following error at start:

Error parsing destination, destination plugin smtp not found in
smtp(
    ^^^^

I did a 
@module smtp
on top of conf after @version.

getting:
Plugin module not found in 'module-path'; module-path='/usr/lib/syslog-ng', 
module='smtp'


I looked:

 pwd
/usr/lib/syslog-ng


[root@ns42 syslog-ng]# ls
libafamqp.so  libafmongodb.so  libafsocket-notls.so  libafsocket.so  
libafuser.so      libconfgen.so      libcsvparser.so  liblinux-kmsg-format.so  
libsyslogformat.so
libaffile.so  libafprog.so     libafsocket-tls.so    libafstomp.so   
libbasicfuncs.so  libcryptofuncs.so  libdbparser.so   libsyslog-ng-crypto.so   
libsystem-source.so

a syslog-ng --module-registry |grep smtp
gives nothing.

hmm,
what next?

I searched around but was not able to find a solution.

Do I need something to install?
And what could the packagename be?

Can someone help?
TIA

Stefan