Mass Mailing option using SendGrid API
SendGrid Send Emails submenu in Email Marketing Reporting menu can be use
for viewing Mail Details.
In SendGrid Send Emails Will Show the Error Emails and cause of Error in The Record.
It also include Mail Bounce Check
Bounce Check Button Will show cause of the bounce Email in the page view.
Resend Error Emails Button in the action menu can be use for resend the selected
error emails.

You need to get a SendGrid API key To use This module
It work with using the API Key. It can be set in the configuration.
SendGrid Template Details submenu in Email Marketing configuration using to create
email templates.
SendGrid From Emails submenu in Email Marketing Configuration using for storing
From Emails.
In Email Marketing Mailing Form contains a page named SendGrid Email.There we can select
the Sending Template.
We could Use Recipients field to sort the recipient emails.
Mail can be send by using SendGrid Button in Mailing Form.
SendGrid Send Emails submenu in Email Marketing Reporting menu can be use
for viewing Mail Details.
In SendGrid Send Emails Will Show the Error Emails and cause of Error in The Record.
It also include Mail Bounce Check
Bounce Check Button Will show cause of the bounce Email in the page view.
Resend Error Emails Button in the action menu can be use for resend the selected
error emails.