EDIT: I am using the Mass Mailing module within Odoo v10 Enterprise. I have a mailing list set up with 2748 contacts. I would like to send a message to them all regarding sales, new products, change in store hours, etc. When sending messages through here, it is send in batches, but only about 400 are actually sent. The rest are sent to the 'failed to send' screen and have to be manually resent individually. How can I configure Odoo to send them all together, or to automatically break them into clumps instead of just failing them.

Original Post and Details: When sending mass mailings using Gmail SMTP as outgoing mail server, we are limited to only so many messages a day, then the rest on our list just show up as failed to send. Is there a way to increase the limit of messages sent, or an easy way to have them broken up automatically over a few days if need be to make sure they are all sent instead of just the first few hundred. We have ~2500 contacts on our mailing list and cannot send anything to all of them. Ideally I would like to be able to send all of the messages at once. 

We are running Odoo Enterprise V10 self-hosted on Ubuntu Server 16.04.