How do I warm up a new email domain before sending at volume?

Going from zero to sending a bunch of emails is bad. A brand-new address that suddenly starts sending your whole automated volume looks suspicious to inbox providers, and you risk landing in spam on every send after that.

Start by using the new address like a normal person would. Send everyday emails from it, including internal ones around the business, and get people to reply. If anything lands in spam, ask the recipient to mark it as not spam and move it to their primary folder. All of those little signals show quality and build the domain’s reputation.

An inbox warm-up tool speeds this up. It sends emails from your inbox to hundreds of other inboxes, and they reply with ordinary-looking conversation. If you send enough fake emails, Google thinks it’s a real email inbox eventually. It’s a tactic that came out of the spam world, but we’ve found using it to prime an inbox properly works really, really well. Expect some odd messages in the inbox while it runs, and warn whoever looks after it.

Give it a week at least. Depending on how the warm-up goes, you can usually be fully switched over within a couple of weeks. Then move all your flows to the new sender in one clean move.