features

Everything Sendbox does for cold email

The full outreach workflow in one platform: mailboxes and warmup, sequences, a unified inbox with AI reply tagging, analytics, and webhooks, all running on dedicated IPs instead of shared infrastructure.

10 features3 categories

Showing 10 of 10

Outreach
Campaigns
Build cold email sequences with as many steps and wait periods as you need, A/B variants on every step, IF/THEN/ELSE branching and spintax. Sendbox sends inside each lead's working hours, rotates across your mailboxes, stops the moment someone replies, and shifts volume toward the copy that is winning. All of it goes out over sending infrastructure that is yours alone.
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Outreach
Mailboxes
Connect Gmail and Outlook with OAuth or any provider over IMAP/SMTP, with no cap on how many mailboxes you add. Warmup starts automatically on a ramp you control, SPF, DKIM and DMARC are checked for every domain, and each mailbox shows its live status, so you know which ones are ready to send.
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Outreach
A/B Testing
Write as many variants as you like for any step. Sendbox moves sending volume toward the variant that performs best and pauses the ones that fall behind, using thresholds you set. You get the benefit of testing without someone having to check the numbers and switch variants by hand.
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Outreach
ESP Matching
Sendbox looks up each recipient's email provider from their domain's MX records and sends from one of your mailboxes on the same provider whenever it can. Same-provider delivery tends to look more natural to inbox filters, which helps more of your emails reach the primary inbox.
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Workspace
Unified Inbox
Replies from all your campaigns and mailboxes land in one threaded inbox. Search and filter across everything, reply in context, mark threads read or unread, and archive what is done. Nobody has to log into mailbox number 14 to find out who wrote back.
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Workspace
AI Reply Tagging
Sendbox reads every incoming reply and tags it with categories you define, such as Interested, Not now, Out of office or Wrong person. The AI reply agent can then draft or send responses in the tone and with the instructions you give it. Your team spends its time on the replies that can turn into meetings.
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Workspace
Analytics
Sendbox tracks sends, opens, replies and bounces and breaks them down by campaign, step, A/B variant and mailbox. You see which step loses people, which variant wins and which mailbox is starting to slip. On Agency and Power plans you can turn the same numbers into reports branded for your clients.
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Workspace
Phone Dialer (Coming Soon)
A built-in phone dialer is on the Sendbox roadmap but is not available yet. The plan is simple: call a lead who just replied without leaving Sendbox, with the email thread on screen. Phone numbers and call minutes will be billed separately from your plan. Until it ships, use the unified inbox and webhooks to hand warm leads to the calling tool you already use.
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Data & Integrations
Lead Import & Validation
Upload your leads as a CSV, map the columns, and Sendbox validates every email address on the way in, flagging undeliverable, risky and catch-all addresses before they can bounce. Validation is unlimited on every plan, so cleaning a list never costs extra and your bounce rate stays low.
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Data & Integrations
Webhooks
Sendbox fires a signed webhook when a lead is created or added, replies or bounces, and when an email is sent or opened. Point it at any HTTP endpoint, such as your CRM, Zapier, Make, n8n or your own backend, so the rest of your stack updates the moment something happens.
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Ready to land in primary?

Dedicated IPs, isolated infrastructure, and automatic warmup on every plan. Set up on your own, no sales call, and pay for sending volume, not seats.

Land in Primary See the Plans

Every plan includes dedicated IPs. No per-seat fees. Cancel whenever you want.

Everything Sendbox does for cold email

All features

Campaigns

Mailboxes

A/B Testing

ESP Matching

Unified Inbox

AI Reply Tagging

Analytics

Phone Dialer (Coming Soon)

Lead Import & Validation

Webhooks

Ready to land in primary?