Spam Resource: Seedlist testing: It’s useful, even at Gmail

Al Iverson just published a new interesting post on Spam Resource:

I’ve spent a lot of time lately explaining what exactly seedlist testing is, how it works, and why it’s valuable. I like it. I have a bias, after all, in that my day job is product manager for a suite of deliverability tools, and that includes seedlist-based inbox testing (shameless plug: find more info about the Kickbox Deliverability Suite here). Occasionally somebody will tell me that they’ve heard that seedlist testing can’t be trusted or that it’s not useful now in 2022, because mailbox provider spam filters are so individualistically focused on user feedback. Yeah…they have a point…sort of. But not quite.It is very true that spam filters are very user-centric. Gmail, in particular. Your Gmail spam filter is different than mine. Gmail tracks individual user feedback and tailors the spam filtering experience, if you will, based on the different inputs that you and I provide to it. That means

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