We are using the Gmail API + mailR (https://www.rdocumentation.org/packages/mailR/versions/0.8) to send out emails in bulk. A few of our messages are returning an automated “Message Rejected” email from Google in short and succinct fashion which makes it seem like a pattern. Our approach is iterative, but we are not sure how those are handled internally after the send message function is called. Is this something anyone else has encountered? We’re wondering if it’s a synchronicity issue and adding a sleep interval would stop the issue, or if there’s something else at play; and as sleep intervals would exponentially increase runtime, we were hoping to resolve any ambiguity before trying it.
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