Instantly

Instantly is a cold email outreach platform used by solo founders, agencies, and sales teams when they need to reach hundreds or thousands of prospects at once. It has become the de facto standard in cold email because it combines lead sourcing, inbox warmup, and campaign sending into one tool while staying more affordable than the big enterprise players.

It works simply: connect any number of email inboxes, import or search for a contact list right inside the tool, and build a message sequence with follow-ups. Instantly then rotates emails smartly across inboxes, sends them out gradually like a human, and measures deliverability, opens, and replies so you see exactly what works.