Use Sendgrid to email and Gmail IMAP for Playbooks
You can use Sendgrid to send emails from Salestools.
Firstly if you run on Google Suite you need to enable Less Secure Apps https://admin.google.com/salestools.io/AdminHome#ServiceSettings/notab=1&service=securitysetting&subtab=lesssecureappsaccess
in some cases this link is needed https://myaccount.google.com/lesssecureapps
Then use your email as username, password is your gmail password and server is: imap.gmail.com plus port is 993
For Sendgrid you need to make an account the username is your sendgrid user name and password is the password for Sendgrid.
Server is smtp.sendgrid.net and port is 587 remember to Enable TLS.
Inside Sendgrid you are able to add emails to send from on this link and use as the email adress link to setup email adresses https://sendgrid.com/marketing_campaigns/ui/senders