Smartlead

Smartlead is a cold email platform built with agencies and high-volume senders in mind. Every plan lets you connect unlimited mailboxes at no extra cost, and sending automatically rotates across all of them to spread volume and protect sender reputation.

AI-powered warm-up is included, drawing on a shared warming pool, and the Master Inbox brings replies from every mailbox into one place so nothing gets missed. Pro and higher plans include a CRM, Smart and Prime add an API and webhooks, and agencies can add white-label client workspaces for $29 a month each, so clients see your brand rather than Smartlead's. Add-on services cover email verification credits, mailbox provisioning through SmartSenders, deliverability testing and dedicated sending servers.

Smartlead is popular with lead generation agencies and outbound teams that manage many clients or domains and need control over deliverability.

Base costs $39 a month, or $32.50 billed yearly, for 2,000 active leads and 6,000 emails. Pro is $94 a month for 30,000 leads, Smart is $174 with unlimited leads and Prime is $379 for 500,000 emails a month. There is a free trial with no credit card, and no long-term contract.