I installed Griffon 1.2 and the mail plugin.
griffon install-plugin mail
I created a test:
sendMail(mailhost: '192.168.0.19',
to: 'me@home.com',
from: 'me@home.com',
subject: 'Test Mail',
text:'''
Hello
World''')
But it does not use the mailhost param. It tries to use localhost:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25
I verified the SMTP server via telnet commands and that works.