The deliverability stack, built in
Most platforms sell warmup, validation, and placement testing as add-ons. Sendbox bundles the entire deliverability suite on every plan, on infrastructure that's yours alone.
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Layer 1 of 3
Infrastructure
What your mail is sent on. Yours alone, never shared with another sender.
- Dedicated IPsEach Sendbox account gets an IP address that belongs to it exclusively. That means your inbox placement rises and falls with your own sending habits, never with whatever a stranger sharing your plan did last week.
- Isolated InfrastructureIsolated infrastructure underpins every Sendbox account: your IPs, your sending activity, and your reputation all stay separate from every other user on the platform.
- Human-like WarmupSendbox warmup builds sender reputation gradually by exchanging emails with other warmup mailboxes, which open them, reply to them and move them out of spam. It starts automatically when you connect a mailbox and follows the ramp you set, so new mailboxes are ready to send without anyone managing a schedule by hand.
Infrastructure
What your mail is sent on. Yours alone, never shared with another sender.
capabilities in this layer
Each Sendbox account gets an IP address that belongs to it exclusively. That means your inbox placement rises and falls with your own sending habits, never with whatever a stranger sharing your plan did last week.
Read the breakdownIsolated infrastructure underpins every Sendbox account: your IPs, your sending activity, and your reputation all stay separate from every other user on the platform.
Read the breakdownSendbox warmup builds sender reputation gradually by exchanging emails with other warmup mailboxes, which open them, reply to them and move them out of spam. It starts automatically when you connect a mailbox and follows the ramp you set, so new mailboxes are ready to send without anyone managing a schedule by hand.
Read the breakdownMonitoring
What tells you something is wrong, before a campaign is the thing that tells you.
capabilities in this layer
Spot the mailboxes that are starting to slip, pull them from rotation, run warmup, and bring them back healthy.
Read the breakdownSendbox logs the delivery status of every email that goes out, tracking bounces both by campaign and by mailbox so you know exactly where a problem is originating and which list or mailbox needs your attention.
Read the breakdownEvery sending IP and domain on your account gets watched around the clock through continuous blacklist monitoring. The moment a listing appears, you're alerted, well before it shows up as a dip in reply rates. What actually matters isn't the scan itself, it's how little time passes between a listing happening and you finding out.
Read the breakdownTesting
What you check against before you send, so nothing goes out unverified.
capabilities in this layer
Send your email to a set of seed accounts and see exactly where it ends up, inbox, spam, or somewhere in between. Sendbox reports back an inbox rate, a spam rate, and an overall score so you know whether you're actually ready to launch.
Read the breakdownAn on-demand lookup for one IP or domain at a time: type in the address and get back its listing status across every major blocklist, plus a 0-100 health score. It's built for one-off verification rather than ongoing background monitoring.
Read the breakdownEvery email address is validated automatically when you import leads. Sendbox categorizes each address as deliverable, undeliverable, risky, or unknown with confidence scores so you can decide what makes the cut.
Read the breakdownReady 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.
Every plan includes dedicated IPs. No per-seat fees. Cancel whenever you want.
