Contact Module
Jamroom Developers
The Simple Custom Form module will allow visitors to your site to send a message TO YOU.
The "Support Tickets" module allows you to send an email:
Docs: "Support Tickets"
https://www.jamroom.net/the-jamroom-network/documentation/modules/2046/support-tickets
All the data is store in a datastore, so if you want to send something programmatically, you can do that too.
If you're looking for a module that allows non-admin users to send emails from your server, that module doesn't exist and would need to be made if you wanted to, but it seems like it would be a spam tool.
updated by @michael: 11/25/17 09:43:36PM