Just installed Askbot, but when new user register, email are not been sent for validation. The outgoing mail config section in settings.py are shown below:

#outgoing mail server settings
SERVER_EMAIL = 'smtp.webfaction.com'
DEFAULT_FROM_EMAIL = 'xyz@linuxbsdos.com.com'
EMAIL_HOST_USER = 'cmail'
EMAIL_HOST_PASSWORD = 'xtvwedcv'
EMAIL_SUBJECT_PREFIX = 'Automated Message from LinuxBSDos.com'
EMAIL_HOST='smtp.webfaction.com'
EMAIL_PORT='587'
EMAIL_USE_TLS=True # was False
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'

What else do I need to set to get it to send email on user registration?

Suggestion:

How about a test email send feature from the UI, as it is on OSQA?