There have been delivery issues with a google group with > 40k subscribers, and over the last 3-4 days, there were issues with automated sending of emails to the group. Earlier, we used a Google Apps Script to send email, taking content from a web page. But overnight, the team changed to sending via smtp, and the group refused the incoming messages.
My first suspicion was that the From: or some other header was wrong, due to which the messages were getting rejected as not having permission to post. But on checking the sent messages to another group - which had been sent successfully - found that the headers were right, only the sending method was SMTP instead of Google Apps Script, and the content template was different.
After a couple of days of manual sending by the team with the same new template, the SMTP sending started working automatically. So probably this was some sort of anti-spam strategy by google groups.
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