Can not send email from openmeetings

[Evans Bernier]

Hello, I am not able to send email from openmeetings by "contacts and messages" and when a new user subscribe, no email is send.
I try my SMTP server with port 25, withtou success. I tried to send an email by "telnet" directly from the same server than openmeetings is running and it worked. So I know that my SMTP is working. Why I can not send email ?
I got this error in my log file :
DEBUG 08-05 02:22:17.656 Roommanagement.java 1167842356 200 org.openmeetings.app.data.conference.Roommanagement [NioProcessor-1] - getRoombyId : 11
DEBUG 08-05 02:22:17.661 ConferenceService.java 1167842361 614 org.openmeetings.app.remote.ConferenceService [NioProcessor-1] - getRoomClientsListByRoomId
DEBUG 08-05 02:22:17.661 Roommanagement.java 1167842361 200 org.openmeetings.app.data.conference.Roommanagement [NioProcessor-1] - getRoombyId : 11
DEBUG 08-05 02:22:17.666 ConferenceService.java 1167842366 614 org.openmeetings.app.remote.ConferenceService [NioProcessor-1] - getRoomClientsListByRoomId
DEBUG 08-05 02:22:17.666 Roommanagement.java 1167842366 200 org.openmeetings.app.data.conference.Roommanagement [NioProcessor-1] - getRoombyId : 12
DEBUG 08-05 02:22:17.670 ConferenceService.java 1167842370 614 org.openmeetings.app.remote.ConferenceService [NioProcessor-1] - getRoomClientsListByRoomId
DEBUG 08-05 02:22:17.670 ConferenceService.java 1167842370 373 org.openmeetings.app.remote.ConferenceService [NioProcessor-1] - Found 3 rooms
ERROR 08-05 02:22:38.503 UserService.java 1167863203 885 org.openmeetings.app.remote.UserService [NioProcessor-1] - [composeMail]
java.lang.NumberFormatException: For input string: ":3"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48) [na:1.6.0_26]
    at java.lang.Integer.parseInt(Integer.java:449) [na:1.6.0_26]
    at java.lang.Integer.valueOf(Integer.java:554) [na:1.6.0_26]
    at org.openmeetings.app.remote.UserService.composeMail(UserService.java:763) [openmeetings.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:1.6.0_26]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [na:1.6.0_26]

Thanks for your help !