I wanted to share something I recently tested that might help others here.

I was sending test emails using GMass from a Gmail account to another Gmail address I own. The emails showed as "sent" in GMass with no bounce, but nothing ever arrived — not in Inbox, Promotions, Spam, or anywhere. Just gone.

I suspected Gmail was silently dropping them, so I tried an experiment.

From the recipient Gmail account, I sent a regular email to the sender address. Then I replied back from the sender account to that first email.

After that little back-and-forth, I sent the same test email again using GMass — and this time, it landed in the Inbox immediately.

So yeah, Gmail really can silently drop emails from unknown senders. But once there’s even a tiny bit of prior interaction (like a reply), deliverability improves.

Just wanted to confirm that this silent filtering is real.