It can be challenging to consistently achieve inbox delivery at Gmail and Google Apps. One reason is that Gmail has very complicated filtering strategy, which learns from and classifies hundreds of items within a message to detect and prevent spam. They are machine learning-based and measure hundreds of things about incoming mail. The filters are continually adapting to spam threats and updating how they treat specific mail.
The impact of this approach is that filtering is far from static. What passes to the inbox now, may fail in short order.
We’ve put together a bit of intel about Gmail filters to support senders in ensuring their programs are in tip-top shape to achieve inbox placement at Gmail/GoogleApps.
Google Product Forum - Mail server blocked by gmail as a bulk sender
Special thank you to Carmi Lopez-Jones for helping draft this blog post!
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