Articles by David Lara
22 articles
Deliverability8 min
How Email Warmup Actually Works: Ramps, Replies, and Safety Controls
Learn how email warmup works, what mailbox providers require, and how Norbelys controls volume, replies, sender health, and campaign capacity.
AIBuild note6 min
Run your entire cold-email operation from an AI agent
Norbelys ships a remote MCP server: one URL that hands Claude, Cursor, or your own agent the whole platform as tools — import leads, verify, segment, launch, and monitor without opening a browser tab.
Prospecting3 min
How to build a cold email lead list that doesn't bounce
A lead list is a pipeline, not a purchase: write the ICP down, source by trigger, verify every address before it teaches Gmail who you are, and build small, specific segments.
Strategy3 min
What is cold email? Definition, legality, and why it isn't spam (when done right)
Cold email is a one-to-one business email to someone who hasn't heard from you — legal in the US under CAN-SPAM, regulated in the EU, and separated from spam by relevance, identity and a working unsubscribe. The complete starting point.
Strategy6 min
Cold email reply triage: the four replies your system must handle
Interested, not now, wrong person and auto-replies should not enter the same workflow. Here is the reply triage model that protects pipeline, compliance and sender reputation.
Deliverability4 min
Secondary domains for cold email: never send cold from your main domain
The standard 2026 setup: lookalike secondary domains for outbound, 2–3 mailboxes each, round-robin rotation under 40 sends a day — with the DNS records, warmup timeline and redirect details most guides skip.
Copywriting4 min
Cold email first lines: the opener is the real subject line
Gmail and Outlook show your first line in the preview pane before anyone opens anything. How to write proof-of-homework openers — with six rewrites of the lines everyone sends and a test for whether yours passes.
Deliverability6 min
Your email list rots before you send: clean it or pay in reputation
Why stale B2B lists turn into bounces, role inboxes, burners and risky domains, how to clean a CSV before launch, and why Norbelys verifies every import instead of selling credit packs.
Strategy5 min
The best time to send cold email, and why it's the smallest lever you have
The real data on send day and hour — weekends are dead, mid-week mornings win — set against the levers that actually move replies: list quality, personalization, follow-ups, and how fast you answer back.
Deliverability7 min
Email warmup week one: the ramp, the safety gates, and what the numbers do not prove
Norbelys starts with a base target of 5 and adds 2 per ramp day, but actual warmup volume can be lower. Here is why capacity, cohorts, health, and provider guidance matter more than a perfect chart.
Strategy6 min
The follow-up curve: where a cold sequence's replies actually come from
The real numbers on follow-ups — a 4–7-step sequence roughly doubles a one-and-done, 42% of all replies come from follow-ups, and one extra touch lifts replies 65.8%. Here's the curve, and where to stop before you start hurting your reputation.
Strategy4 min
Cold email subject lines by the numbers: length, questions, and reply rate
What a 12-million-email outreach study can — and cannot — tell us about subject-line length and personalization, plus the rule that survives every benchmark: test it on your own list.
Deliverability3 min
How to read email headers like a postmaster
Received chains read bottom-to-top, Authentication-Results don't lie, and a five-minute header read explains most delivery mysteries. A field guide.
Deliverability3 min
Half of your email opens are robots. Here's how to find the real number.
Apple Mail opens your email automatically, Gmail caches every image, and security software clicks every link. What's actually left when you filter the noise out — and how to make decisions on it.
Deliverability3 min
Email blacklists: how to check if you're listed — and actually get off
Which DNS blocklists matter in 2026, how to check your domain and IPs in one sweep, and the delisting process that works (it's free, despite what some sites imply).
Deliverability3 min
The Gmail & Outlook sender rules, explained like you're busy
SPF, DKIM, DMARC, one-click unsubscribe and the 0.3% spam threshold — what mailbox providers actually require from senders now, in plain language, with a checklist.
Deliverability3 min
Why your emails go to spam (it's rarely the words)
Spam placement in 2026 is mostly reputation, authentication and engagement — not trigger words. A diagnostic order that finds your real problem in 20 minutes.
Deliverability7 min
How long does it take to warm up a new email domain?
Use two weeks as a minimum observation period for a low-volume mailbox and four to eight weeks for a new or high-volume domain. The real answer depends on target volume, engagement, authentication, and provider feedback.
Deliverability3 min
How to read a DMARC report (no XML degree required)
Gmail, Microsoft and Yahoo send you gzipped XML about every email claiming to be your domain. Here are the four fields that matter and how to spot a spoofer.
Deliverability3 min
p=none vs p=quarantine vs p=reject: when to move (and when not to)
More than half of domains with DMARC never leave p=none. Here's the honest ladder from monitoring to enforcement, with the checks to pass before each step.
Deliverability4 min
DKIM, explained: selectors, key sizes and the failures nobody notices
How DKIM signing actually works, what a selector is, why 1024-bit keys are on borrowed time, and how to check the key your domain is really using.
Deliverability4 min
SPF records, explained with real examples (and the 10-lookup trap)
What an SPF record actually says, how to read every mechanism, copy-paste examples for common stacks — and the DNS lookup limit that silently voids it.