Gmail SMTP setup settings:
SMTP username: Your Gmail address
SMTP password: Your Gmail password
SMTP server address: smtp.gmail.com
Gmail SMTP port (TLS): 587
SMTP port (SSL): 465
SMTP TLS/SSL required: yes

not able to send mail on user creation with these settings.

the error I am getting is this.
Unable to send email via JavaMail
Prime Messaging Exception