Can't get sendmail to work

Add-ons Actions
1

Hello,

I’m trying to use the sendmail action.
But I can’t get it to work.

  • I placed the “org.openhab.action.mail-1.8.3” action in the addons map of my openhab server.
  • i set the settings in my config file:
######################## Mail Action configuration ####################################
#
# The SMTP server hostname, e.g. "smtp.gmail.com"
mail:hostname=smtp.telenet.be

# the SMTP port to use (optional, defaults to 25 (resp. 587 for TLS))
mail:port=587

# the username and password if the SMTP server requires authentication
mail:username=XXX
mail:password=XXX

# The email address to use for sending mails
mail:from=XXX@telenet.be

# set to "true", if TLS should be used for the connection
# (optional, defaults to false)
mail:tls=true

# set to "true", if POP before SMTP (another authentication mechanism)
# should be enabled. Username and Password are taken from the above
# configuration (optional, default to false)
#mail:popbeforesmtp=
  • I used a test rule:
when 
  System started
then
  sendMail("tomymail@telenet.be", "This is the email subject", "This is the email body")
end

I don’t know or this line has to be in the rule file (with or without it, I get the same result):

import java.util.List

Problem is that I don’t receive any e-mail.
In the log I see a error that the mail could not be send with the following reason:

Caused by: javax.mail.SendFailedException: Send failure (javax.mail.MessagingException: Can't get local hostname.  Please correctly configure JDK/DNS or set mail.smtp.localhost)

My “/etc/hostname” contains:

openhab

My “/etc/hosts” contains:

127.0.0.1	localhost
127.0.1.1	openhab.localdomain	openhab

I have no idea what is wrong, how can i solve this?

Thanks!