[cnees]

Gmail postmaster tools says, "This dashboard shows the percentage of user-reported spam vs emails that were sent to the inbox for active users. Emails delivered directly to the spam folder are not included in the spam rate calculation. Only emails authenticated by DKIM are eligible for spam-rate calculation."

The threshold for the number defined above is 0.3%; that's the point where Gmail starts penalizing the sender by putting their emails in spam folders.

[hedora]

Oh, so if 0.3% of people subscribe to a mailing list, then mark it as spam (instead of unsubscribing), then it goes to my spam folder?

That explains why I had to immediately disable gmail's spam filter.