OM 3.0.6 pb send mail

[phil]

HI

I on a vps, debian jessie, om 3.0.6
Configuration mail :

smtp_server localhost
smtp_port 25
system_email_addr nore...@openmeetings.apache.org 
<mailto:nore...@openmeetings.apache.org>
email_username XXXX64
email_userpass XXXXXXXX
mail.smtp.starttls.enable 0
mail.smtp.connection.timeout 30000
mail.smtp.timeout 30000


When I want to send a mail, nothing...

Sorry for my poor english

Have you an idea ?

thanks