001 / B2B GTM Engineering · Insights

Insights from our own outbound records

This is what we've learned running cold email and LinkedIn programs for B2B companies. The research pages show how we counted, so you can quote the figures or check them against your own.

Cost model

What cold email infrastructure costs in 2026

The mailboxes, domains and tools it takes to send 5,000, 10,000 or 30,000 cold emails a month, priced at public list prices.

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Guide

Public data sources you can scrape and sell into

The 22 free government and regulator sources we've built prospect lists from, with who each one reaches and what we ran into.

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Spamhaus vs SURBL for a cold email sending domain

The two blocklists sound alike but they cost us different amounts, so we replace a domain for one and keep sending through the other.

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How we set up a cold email sending domain

We follow the same steps for every new sending domain, and each one exists because skipping it cost us deliverability.

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How we raised our LinkedIn connection acceptance rate

On one program, acceptance went from 8.4% to 15.2% when we changed only the list. Here is the rule, how we build the campaign, and how we write the note.

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Why we write shorter cold emails for Microsoft inboxes

Contacts on Microsoft mail replied at a fraction of the Google rate, so we split each campaign by mail host and send the Microsoft group a shorter email.

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How we verify a B2B contact list before sending

A valid email verdict says the mailbox works, not that the person still does, so we check the person first and the address second.

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How we write cold email subject lines

Our subject lines are short, lowercase and plain, and we check each one against a fixed set of rules before it goes out.

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How we personalize cold email at volume

We personalize one sentence per lead, keep the rest of the body fixed, and skip the opener whenever we have no real fact to put in it.

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How many cold emails should one mailbox send a day?

We cap a warmed Google mailbox at 15 cold emails a day, load it to 70% of that, and get about 231 emails a month from it.

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Want this built for your pipeline?

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