Heey Nithish,
You can use the following appstore module for emails in 9.18.1:
https://marketplace.mendix.com/link/component/120739
With this module the following documentation is provided:
https://docs.mendix.com/appstore/connectors/email-connector/?_gl=1*ob5zq*_ga*MjQ4MjA3NTA5LjE2OTEwNDMzMDM.*_ga_4PE2C4QFC7*MTY5MjAyMTM5OC4xOS4xLjE2OTIwMjE0NTUuMy4wLjA.
Hope this helps,
kind regards,
Edo