Is your ESP at fault for Gmail Promotions tab?
Still have a question, spotted an error, or have a better explanation or a source we should cite?
Short answer: no. Your ESP has nothing to do with it.
Gmail decides which tab an email lands in based on content signals from the message itself: the type of links, the HTML structure, the presence of an unsubscribe header, how many recipients you're sending to at once, and what Gmail's models have learned from how similar emails have been treated in the past. The sending platform doesn't factor in.
The Promotions tab isn't a spam folder. It's Gmail organizing your inbox. Marketing emails land there because they're marketing emails, not because something's broken. (Plenty of legitimate, well-engaged newsletters land in Promotions every day.)
If you want to try landing in Primary, the levers are on your end: personalized From names, reduced commercial structure in the HTML, and most importantly, strong engagement from your list. Gmail watches how subscribers interact with your emails. If enough of them move your messages to Primary or reply to them, the algorithm may start routing you there.
But for most newsletters and marketing programs, Promotions is the right tab. The better question is whether your subject lines and preview text are compelling enough to get opened from there.
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