(Old Version) Set up a custom SMTP

Setting up a custom SMTP to send email can be done in the Settings of your inbox.

SendGrid

Address: smtp.sendgrid.net

SMTP Address: smtp.sendgrid.net

Port: 587

SMTP Login: should be your login account to sendgrid

SMTP Password: should be your password to your account

SMTP Authentification: can be left to Default

Don't forget to click Save at the top and you are good to go.

For more information, see  SendGrid documentation