You should be able to see the output by putting the plexemail jail IP address into your web browser, but I suspect it's worked from the 'Web page created successfully' message :D
Not sure about Gmail settings, as I've got a hosted domain and e-mail service, but my e-mail settings looks something like this:
##Email
email_enabled = True
email_individually = False
email_use_bcc = False
email_to = ['
receiving@email.com']
#This requires plex_username and plex_password to be filled to get emails of shared users.
email_to_send_to_shared_users = False
email_unsubscribe = ['']
email_from = '
sending@email.com'
email_from_name = 'Plex Server'
email_smtp_address = '
smtp.server.com'
email_smtp_port = 465
email_use_ssl = True #Port must be an SSL port i.e. 465
email_username = '
sending@email.com'
email_password = '
password'
# Only valid if web_enabled = True and upload_use_cloudinary = False
email_use_web_images = True
email_skip_if_no_additions = False