Hi
Thanks for the question. Gmail implements sending limits on their accounts: https://support.google.com/a/answer/166852 and it sounds like you exceeded those limits for this workflow.
Setting up an automation in Mailchimp or similar would be the best way to trigger a welcome series to that many subscribers, but I understand from your note that the Google Drive link you wish to embed is created in the Zap
I did some searching and found this article about creating personalized files in Mailchimp - do you think that may work for you? https://mailchimp.com/help/use-merge-tags-to-send-personalized-files/
You could then use the Add Subscriber to Tag action in your Zap, to add the subscriber to the automation you have created in Mailchimp.
Hope this helps!
Hi
Try using a transactional email service such as Mailgun: https://zapier.com/apps/categories/transactional-email
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