To set up Sendgrid SMTP, firstly you will need to create a SendGrid Account. If you do not have an account on SendGrid, browse the https://sendgrid.com/ to create an account. The second thing you need is a Sendgrid API.
You have to set the following details in the WP Mail Booster Plugin in order to configure Office 365 using Username & Password. SMTP Host: smtp.live.com, SMTP Port: 587, Username: Office 365 account email.
WP Mail Booster is the WordPress SMTP plugin used for an efficient email delivery. It is an easy and lightweight plugin which is used to Send Emails, Monitor Emails and also troubleshoot the outgoing Emails easily.