How many emails should a test have?

We don’t publish a magic number. Fewer, better-chosen leads give clearer answers than a big, loose list.

Is there a free plan?

There are no plans. Warmup and verification are free; sending costs $1 per 1,000 emails from a prepaid wallet.

Can co-founders share one inbox?

Yes. Invite them; replies from every mailbox land in one shared inbox with assignment and comments.

Founder-led outbound, for testing what the market wants.

Early on, cold email is research as much as sales: which problem gets a reply, which role cares, which words land. Inboxed lets a founder run small, careful tests from a separate domain, without a monthly plan to justify.

Start free See pricing

Inboxed for startups is a good fit if

You’re a founder doing sales yourself
You’re still testing positioning and ideal customer
Your stack is light: Attio or folk, Linear, Slack

The workflow in Inboxed

What you’d use, and how it fits together. Everything here is in the product today.

Test positioning with variants

Give a step up to five versions (A to E). They’re sent evenly, and the winner can take the remaining volume automatically.

A separate sending domain

Buy a domain from the wallet with DNS set up for you, connect a mailbox on it and let warmup run while you write.

Learn more

Small lists, tight targeting

Target by country and company size, and leave out solo founders when your data has company size.

Replies where you work

Push interested replies to Attio or folk as people with a note, open Linear issues for follow-ups, or post to Slack.

Learn more

Ask Claude

Connect the MCP server and ask Claude what came in today or to draft replies for your approval.

Learn more

Spend caps

Lock a campaign’s daily cap and budget so experiments stay experiments.

Set it up

Buy or connect a secondary domain and one or two mailboxes; warmup starts free.
Write three positioning variants for the first step.
Import 100 to 300 well-chosen leads and launch with a low daily cap.
Read every reply, tag what you learn, and keep the variant that earns real conversations.

Example, not a customer story

Example: problem-validation sequence

Written by us as an illustration. Variants A, B and C test three framings of the same problem.

Day 01. Three framingsA: the cost of the problem. B: the time it takes. C: the risk it creates. Same ask in each: “Is this on your radar?”
Day 32. Ask for adviceSame thread: “Even a no helps: how do you handle this today?”
Day 83. Offer somethingNew thread: early access or a free pilot in exchange for 20 minutes of feedback.

What it costs

Inboxed charges $1.00 per 1,000 emails that actually send, from a prepaid wallet. No plan, no seats. Building, launching, warmup and verification are free.

Validation sprint

2 mailboxes × 20 emails a day each × 10 sending days = 400 emails

400 ÷ 1,000 × $1.00 = $0.40 a month

$0.40/ month

First repeatable motion

2 domains × 2 mailboxes each × 30 emails a day × 22 sending days = 2,640 emails

2,640 ÷ 1,000 × $1.00 = $2.64 a month

$2.64/ month

These are worked examples with round numbers, not averages. They assume every email sends; unsent emails and leads that fail verification cost nothing. Mailboxes and domains are paid to your email provider and registrar, and any AI or data-provider keys you connect bill on your own accounts. The smallest top-up is $5.00 (5,000 emails); credit never expires and isn’t refundable. How pricing works.

Compliance notes

The rules that come up most for this kind of outreach, summarised from the sources linked. This isn’t legal advice.

EU and UK: record your lawful basis and tell people where you got their data

Cold B2B email to named people usually relies on legitimate interests (GDPR Article 6(1)(f)). When data didn’t come from the person, Article 14 asks you to tell them, at the latest in your first message, who you are and where the data came from. Article 21 lets anyone object to direct marketing at any time, and you must then stop. Every Inboxed lead stores its source and lawful basis (legitimate interest by default, or consent or contract), and Erase this person keeps only a hash so they’re never emailed again.

US recipients: CAN-SPAM has no B2B exception

The FTC’s guide says the law makes no exception for business-to-business email. Every commercial email needs accurate headers and subject lines, a valid physical postal address, and a working opt-out honoured within 10 business days. In Inboxed, set your company name and postal address once under sender details, keep the unsubscribe footer on, and every unsubscribe is added to your suppression list automatically.

UK: corporate addresses vs sole traders

The ICO says PECR doesn’t require consent to email corporate subscribers, as long as you say who you are and give a valid opt-out address. Sole traders and some partnerships count as individuals and need consent or the soft opt-in. UK GDPR still applies to a named person’s work address. If your data has company size, campaign targeting can exclude solo founders (company size 1).

Templates to start from

Ask before pitching
Asks whether a short pitch is welcome before sending one. Low pressure, good reply rates.
Simple introduction
Three short emails: who you are, one useful detail, a polite close.
Partnership proposal
Proposes working together when your audiences overlap, and says what each side gets.

Integrations that fit

Attio
Interested leads and booked meetings become Attio people with a note; unsubscribes and bounces are logged as notes.
folk
Add interested leads and booked meetings to folk as people with a note, and log unsubscribes and bounces.
Linear
Create a Linear issue in a team when a lead replies or books a meeting, with an optional label.
Slack
Get a Slack message when a lead replies with interest, plus optional alerts for meetings, bounces and campaign events, through an incoming webhook.
Claude (MCP)
Work with Inboxed from Claude through our MCP server: read replies, draft answers for approval, check mailboxes and pause campaigns.

Questions

How many emails should a test have?: We don’t publish a magic number. Fewer, better-chosen leads give clearer answers than a big, loose list.
Is there a free plan?: There are no plans. Warmup and verification are free; sending costs $1 per 1,000 emails from a prepaid wallet.
Can co-founders share one inbox?: Yes. Invite them; replies from every mailbox land in one shared inbox with assignment and comments.

Warm up today. Launch when you’re ready. Pay only for emails that send.

No subscription, no card to start. Connect a mailbox and warmup begins in under a minute.

Start free See how pricing works