Email deliverability tools

This category covers the infrastructure beneath your sequencing tool: secondary sending domains, inbox provisioning, DNS records (SPF, DKIM, DMARC), automated warmup, inbox rotation and reputation monitoring. It sits between finding an address and sending the message. An email finder gets you the address. An outreach platform writes and schedules the sequence. Deliverability tooling is the difference between landing in a primary inbox and landing nowhere.

Most teams need it once they scale past a few dozen sends a day, or the moment they consider running cold email from the domain their clients and candidates already use. Sending outbound from your primary domain is the most expensive mistake in this category — a burned domain takes months to recover, and it takes your everyday email down with it.

When comparing options, look at whether the vendor buys and configures domains for you or expects you to do it yourself; which inbox provider sits underneath, and how that affects placement; the length and quality of warmup; how many inboxes you can rotate and what each costs; whether sending limits ramp automatically; and whether you get genuine placement monitoring or just an open rate.