Furnace

Furnace is a cold email platform that handles the technical and operational work of outbound sending, so businesses can focus on choosing prospects, writing messages, and responding to interested leads. Its services include sourcing leads with verified email addresses, purchasing and setting up domains and mailboxes, warming them up, and monitoring deliverability. If a mailbox burns out, Furnace replaces it at no extra cost and works to maintain the sending volume included in the customer’s plan.

The platform supports campaign creation and follow-up sequences, while its team offers strategy and messaging guidance through calls. Customers can also work with Furnace through Claude, ChatGPT, and other AI tools, or connect using its API and webhooks. Plans start at $179 per month, with monthly options for different lead and email volumes and custom Enterprise pricing. Furnace positions itself as an alternative for teams that want outbound sending managed for them rather than handling domains, mailboxes, and warmup themselves. Its service is month to month, with no free trial.