Can I fix deliverability by changing ESPs?
Still have a question, spotted an error, or have a better explanation or a source we should cite?
Probably not. And the reason matters more than the answer.
Deliverability problems usually follow the sender, not the platform. If your list has a high bounce rate, a lot of spam traps, or a history of generating complaints, those problems travel with you to the next ESP. Your domain reputation goes with you. Your subscriber engagement history (or lack of it) goes with you. The new ESP gets you a clean set of IP addresses, and that helps briefly. But if you're sending the same list, the same content, at the same frequency, the same patterns will emerge on the new infrastructure.
There's also the warmup problem. Every new IP address starts with no reputation. Inbox providers are cautious about new senders. If you move to a new ESP and try to send at full volume immediately, you'll hit throttling and filtering that you weren't hitting before, on top of the original problem.
The right question is: what's actually causing the deliverability issue? If it's your list quality, that's fixable without changing ESPs. If it's your authentication setup, that's fixable. If it's your content or send frequency, that's fixable. Changing ESPs sometimes makes sense if the platform genuinely has infrastructure problems or you need features it doesn't offer. But it's rarely the right first move when deliverability is the concern.
If you're not sure what's actually causing the problem, our free tools can check your authentication setup, and if you're in a real deliverability crisis, our SOS hotline is free and we don't pitch you when you call.
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