Knowledge Base
Operator-written guides on cold email infrastructure, domain setup, deliverability, solution pages, buyer comparisons, and campaign operations.
SolutionsCold email inboxes
Managed M365 inboxes for outbound teams — DNS configured, fulfilled within 24 hours.
Read articleSolutionsMicrosoft 365 mailboxes for cold outreach
Managed M365 mailboxes for B2B cold outreach — enterprise infrastructure, DNS configured, fulfilled within 24 hours.
Read articleSolutionsCold email infrastructure provider
Full cold email infrastructure — domains, routing, DNS, and ongoing management.
Read articleSolutionsCold email inbox provider for agencies
Inbox infrastructure for agencies managing cold email across multiple clients.
Read articleCompareOutlook vs Google Workspace for cold email
How deliverability, sending limits, and warmup time differ between Microsoft and Google.
Read articleCompareShared IP vs unique IP for cold email
How shared vs unique IP infrastructure affects deliverability — and why it matters more than most operators realize.
Read articleCompareHow to choose a cold email inbox provider
What to evaluate before committing to an inbox provider — and which type fits your operation.
Read articleCompareWhat to look for in a Microsoft 365 mailbox provider
What separates a trustworthy M365 mailbox provider from one that will cost you more than you saved.
Read articleInfrastructure GuidesCold email infrastructure guide
Domains, mailboxes, routing, DNS, and deliverability — a complete cold email infrastructure reference.
Read articleInfrastructure GuidesWhat is a proxy domain?
What proxy domains are, how they protect your primary domain, and why serious cold emailers use them.
Read articleInfrastructure GuidesHow many domains and inboxes do you need for cold email?
How to size your domain and inbox count based on your sending volume goals.
Read articleInfrastructure GuidesSPF, DKIM, and DMARC for cold email
What SPF, DKIM, and DMARC do and why missing any of them hurts deliverability.
Read articleInfrastructure GuidesHow long does email warmup take?
Realistic warmup timelines and the factors that affect how long it takes.
Read articleInfrastructure GuidesCold email domain setup checklist
Every setup step from domain registration to first send — use it for every new sending domain.
Read articleInfrastructure GuidesWhy Outlook for cold email
Why most B2B outbound teams choose Microsoft Outlook over Google for cold email.
Read articleInfrastructure GuidesHow to recover a burned domain
Options and realistic expectations for a domain with damaged sending reputation.
Read articleInfrastructure GuidesHow your mailbox infrastructure affects inbox placement
How domain age, warmup, authentication, and provider quality affect whether emails land.
Read articleInfrastructure GuidesHow to connect Microsoft 365 to Instantly
Step-by-step guide for connecting Microsoft 365 and Outlook mailboxes to Instantly with screenshots.
Read articleCold Email PlaybookHow to write a cold email subject line that gets opened
What actually works for cold email subject lines — and what to test.
Read articleCold Email PlaybookCold email first lines: how to personalize at scale
How to write opening lines that feel personal without sacrificing volume.
Read articleCold Email PlaybookThe cold email framework that actually converts
The framework serious operators use — short, relevant, and built around the recipient.
Read articleCold Email PlaybookHow to write a follow-up sequence that doesn't annoy people
How to structure a follow-up sequence that adds value without burning your reputation.
Read articleCold Email PlaybookHow to build a cold email list
How to find and build a targeted cold email list without buying bad data.
Read articleCold Email PlaybookICP definition for cold email
How to define who you should actually be targeting in your cold outreach.
Read articleCold Email PlaybookIntent signals for cold email
How to find prospects already in buying mode and time your outreach accordingly.
Read articleCold Email PlaybookHow to clean a cold email list before sending
Verification, filtering, and list preparation steps before a single email goes out.
Read articleCold Email PlaybookHow to structure a cold email campaign from scratch
How to build a campaign correctly — from infrastructure allocation to sequence setup.
Read articleCold Email PlaybookHow to read your cold email metrics
The metrics that actually tell you whether your campaigns are working — and what each one means.
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