Blog
Notes from the
honest side of email
Deliverability, honest analytics and outreach craft — written in plain language, with no growth-hack snake oil.
Earlier articles
253 articles
CopywritingAnalysis5 min
The most-read line in your cold email might be the one you never plan
Direct-mail research says the postscript gets read almost first, not last. What a good P.S. line actually does, with real before/after examples.
ProspectingAnalysis8 min
Where your prospect lives changes your cold email reply rate more than you'd think
A 7.5-million-email 2025 study found reply rates from 1.43% in Poland to 0.51% in the US — geography alone nearly tripled the number. Here's why.
Developer7 min
Connect Claude Code, Cursor, Windsurf, and VS Code to Norbelys over MCP
Step-by-step setup for wiring Claude Code, Claude's custom connectors, Cursor, Windsurf, and VS Code to the Norbelys MCP server, with real commands and configs.
Compliance8 min
What a real data export looks like when you leave a cold-email platform
What a real data export should include when you leave a platform, using Norbelys's actual export bundle, plus the suspend-vs-delete distinction behind it.
Deliverability7 min
How a sending domain actually ends up on a blocklist
Not a single bad email. Blocklisting is almost always one of four repeatable triggers: trap hits, complaint-rate crossings, volume anomalies, or borrowed reputation.
Deliverability10 min
What actually happens the week you onboard a new client's domain
The real week-by-week workflow of bringing a new client's sending domain online at an agency — not the billing model, the actual DNS-to-first-send mechanics.
Prospecting7 min
One inbox for every reply you get, no matter which mailbox sent the email
When you send from five mailboxes, replies land in five inboxes — unless you have one place they all funnel into. Here's what that looks like in Norbelys.
Prospecting6 min
How real estate pros use cold email to reach owners, investors, and tenants
Off-market deals, investor updates, and commercial leasing all move on outbound email. How real estate teams run it without landing in spam.
StrategyAnalysis9 min
The real history of email, from a typo test to your inbox today
How email actually began: Ray Tomlinson's 1971 test message, the @ symbol he almost didn't use, SMTP, Hotmail, Gmail, and 55 years to today's inbox.
Developer7 min
Scoping the API key you hand an AI agent, on purpose
The MCP credential you hand an agent is the whole permission boundary. Practical key hygiene: dedicated keys, rotation, revocation, and OAuth vs. API keys.
AIAnalysis5 min
Running cold email from a spreadsheet and an SMTP relay? Here's what actually breaks
A spreadsheet and a generic SMTP relay can send an email. They can't warm up a domain, catch a reply, or tell you your sender reputation is dying. Here's the gap.
DeliverabilityAnalysis7 min
What actually happens inside a spam filter before your email arrives
A spam filter isn't one gate reading your words and voting. It's three systems — identity, content and collective memory — scoring you in real time.