Email messaging is a useful feature that allows you to send and receive emails without having to access your email inbox.
Company Admins can enable/disable this feature for each pipe separately, so that you can choose from which pipes you want your users to send/receive emails.
To do so, access your Company settings by clicking on your profile picture in the upper right corner of the screen, then on 'Company settings':
Then, click on 'Email Settings' and, within the Email Settings page, access the 'Email Messaging' option.
Once you click on Email Messaging a pop-up will apear where you can select the pipes you want users to be able to send/receive manual emails.
Click on the button next to the pipe's name and, once you're done, save it.