MmSMTP
Mail Merge SMTP add-on generates, saves, and sends email to a list of users that stored in Google Sheet.
The number of emails this add-on produces is limited by the owner’s available email quota; it will not send emails if the owner’s daily email quota has been exceeded. Collaborators using this add-on on the same sheet will be able to adjust the mail merge settings and to send emails to the users that they want.
As we know, the number of emails that this type of add-ons produces is limited by the owner’s email quota; it will not send emails if the owner’s daily email quota has been exceeded.
With the capability to send the emails via the third party SMTP, the add-on has no daily sending limit. Furthermore, the user can set the add-on to send emails offline and monitoring the campaign using Google analytics.