Practical thinking on email outreach, deliverability, cold email practice and AI-assisted sequences.
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Deliverability
How to check your domain's reputation as an email sender: the public signals receivers can see, how to read each one by hand, and what to fix first when your domain is the problem.
Short pieces on the parts of outbound that decide whether a campaign works.
AI
What you can ask an AI assistant about your campaigns, replies, mailboxes and domains once it is connected over MCP, and the security model that keeps it read-only and inside one workspace.
Read articleContacts
How to import contacts from a CSV file into an email tool: the format that works, the Excel problems that blank out columns, and how to map headers and keep empty cells empty.
Read articleDeliverability
Comparing outreach and email marketing tools? The features that change whether mail reaches the inbox, the ones that only look good in a demo, and questions to ask before you pay.
Read articleDeliverability
Why did my email bounce? How to read a bounce message, tell a hard bounce from a soft one, and spot whether a campaign's bounces come from the list or from one sending domain.
Read articleDeliverability
Email bounce codes explained: what each SMTP reply and enhanced status code means, which are hard or soft bounces, and what to do about Gmail, Microsoft and blocklist rejections.
Read articleDeliverability
How to automatically pause a cold email campaign when its bounce or spam complaint rate gets too high: which thresholds to use, why to wait for enough sends, and stopping one domain or all.
Read articleDeliverability
How many cold emails to send per day per mailbox: provider sending limits, warmup, send spacing and sending windows, with a worked capacity estimate you can copy.
Read articleCold Email
How to write a cold email a stranger will actually answer: the five parts, what each line is for, a worked example, the length that works and what to cut.
Read articleDeliverability
Role-based email addresses like info@ and sales@ are real but shared and filtered, and rarely answer cold email. When to keep them and what to do instead.
Read articleCold Email
A sales email signature for cold outreach should be short, mostly text and light on links. What to keep, what to cut, and why heavy signatures cost you.
Read articleCopywriting
How to proofread an email in five minutes: names, merge fields, links, the attachment you mentioned, dates and the thread below. A checklist for real slips.
Read articleCold Email
How to respond to cold email replies: interested, more info, pricing, not now, wrong person, a concern or a no. What each reply means and what to send back.
Read articleSignatures
Outlook email signature formatting breaks because classic Outlook renders mail with Word. Why images stretch and fonts change, and how to build one that holds.
Read articleDeliverability
Your Postmaster Tools spam rate can read 0% while Gmail files your mail as spam. What it counts, the 0.10% and 0.30% lines, and the signals to read with it.
Read articleMetrics
Email bot clicks come from security scanners that follow every link before anyone reads the email. How to spot them, what they break, how to count real clicks.
Read articleSignatures
Which email signature disclaimer lines a law actually requires, which ones do nothing, and how to keep the footer short enough for cold email. With examples.
Read articleCopywriting
Email tone problems you can measure: hedges like just and maybe, apologetic openers, passive voice, long sentences and too many questions. How to fix each one.
Read articleDeliverability
How to clean an email list step by step: typos, dead domains, throwaway and role addresses, old bounces and opt-outs, in an order that protects your domain.
Read articleCopywriting
The common email grammar mistakes spellcheck never flags: its and it's, then and than, could of, merge fields that break agreement. How to fix each one.
Read articleDeliverability
Disposable email addresses come from throwaway inbox services and are soon abandoned. How they get into your list, how to detect them and what to do about them.
Read articleCold Email
Personalized email subject lines break when a merge field is empty or misspelled. How fields and fallbacks work, which to use, and how to test before you send.
Read articleCold Email
How to send email in the recipient's time zone: store IANA zones, not EST or IST, pick a fallback on purpose, and schedule one campaign across many time zones.
Read articleCold Email
AI cold email drafts often invent stats, fake a shared history and sound like everyone else's. Why it happens, the checks to run, and how to brief AI properly.
Read articleMetrics
Apple Mail Privacy Protection loads every image whether or not the email is read. What it does to your open rate, open times and tests, and what to use instead.
Read articleCold Email
Why scheduled emails land an hour early or late after daylight saving time changes, the 2026 and 2027 clock-change dates, and how to set send windows that hold.
Read articleCold Email
Should a follow up email keep the first subject line or get a new one? How Gmail threads replies, when a fresh subject helps, and original examples to adapt.
Read articleCold Email
The best time to send cold emails is early in the prospect's working day. Why timing studies disagree, what holds anyway, and how to test it on your own list.
Read articleCold Email
How to write cold email subject lines from your real reason for writing: five patterns, original examples, the rules Google and the FTC set, and what to cut.
Read articleCold Email
RE: in an email subject line means a reply. On a first cold email it is a fake reply that Google, Yahoo and the FTC all rule out. Here is when RE: is honest.
Read articleCold Email
When to stop following up on cold email: replies, opt-outs, bounces and complaints end a sequence; auto-replies pause it. Plus the Google, Yahoo and FTC rules.
Read articleDeliverability
Every email delivery delay leaves a gap between two Received timestamps. Find the slow hop, spot greylisting and clock skew, and know whose queue held it.
Read articleCold Email
Emojis in email subject lines travel as encoded text and are drawn by the reader's device, so some show as boxes or split in two. Here is how to use them well.
Read articleCold Email
How to write a follow up email after no response to a cold email: why prospects go quiet, what each follow-up must add, worked examples and lines to cut.
Read articleDeliverability
Run a STARTTLS test on every MX host: read the EHLO list, the 220 reply and the certificate, then fix what fails before MTA-STS enforce starts refusing mail.
Read articleCold Email
A breakup email ends a cold sequence without guilt and still earns replies. What to put in it, what to cut, three original templates and when to send it.
Read articleSecurity
Check email headers for spoofing the way a mail admin does: find the lines your own provider added, read its DMARC result and spot forged lines added earlier.
Read articleCold Email
Email subject line length is set by the phone, not a rule. We measured one line on seven phones: 39 to 52 characters showed. Here is how to write for the cut.
Read articleDeliverability
SSL certificate validity fell to 200 days in March 2026 and reaches 47 days in 2029. See each date, what it breaks for mail and link hosts, and how to automate.
Read articleDeliverability
ARC email authentication lets a forwarder vouch for the SPF, DKIM and DMARC results it saw. Learn to read ARC-Seal and cv=, and when receivers trust the chain.
Read articleDeliverability
A missing intermediate certificate passes in your browser and fails in curl, apps and mail servers. Find it with OpenSSL and fix nginx, Apache, Caddy or IIS.
Read articleEmail Design
A 600 px email on a 360 px phone gets cut off or shrunk. The widths, font sizes and tap target sizes that make a mobile friendly email, from Apple and WCAG.
Read articleDeliverability
What is a DNSBL? How a mail server looks up an IP or domain over DNS, what 127.0.0.2 means, and why two blacklist checkers can give different answers.
Read articleDNS
RFC 9989 replaced RFC 7489 in May 2026. Which DMARC tags were retired, what t, np and psd do, how the DNS tree walk works, and the edits worth making today.
Read articleEmail Design
If the inbox shows "View this email in your browser" under your subject, your preheader text is missing. Here is how inboxes pick that line and how to set it.
Read articleDeliverability
Listed on Spamhaus? Read the return code to see whether it is SBL, CSS, XBL, PBL or DBL, what each one means for your mail, and who can get it removed.
Read articleDeliverability
VMC vs. CMC for BIMI: what each certificate proves, the evidence a CA wants, which mailboxes accept it, and how to choose without a registered trademark.
Read articleDeliverability
Moving DMARC from p=none to p=reject in stages: what to check first, how long RFC 9989 says to wait, test mode, and the forwarding trap that bounces real mail.
Read articleDeliverability
Email blacklist removal, list by list: which listings expire on their own, which need a request, what Microsoft wants, and how to stop being relisted.
Read articleEmail Design
Email dark mode is not one thing: some apps use your dark styles, some invert part of it, some invert all of it. See why, and how to design for all three.
Read articleDeliverability
Convert your logo to SVG Tiny PS for BIMI: the rules the file must follow, the edits a typical SVG export needs, a worked example and Gmail's size rules.
Read articleDeliverability
BIMI logo not showing in Gmail, Apple Mail or Yahoo? Check these seven causes in order, from DMARC policy to certificate, with the exact command for each one.
Read articleDeliverability
SPF passes, DKIM passes, and DMARC still fails. Learn what DMARC alignment compares, how to spot the mismatch in a header, and the fix for each common cause.
Read articleDeliverability
We sent one cold email through a spam filter as plain text, clean HTML, HTML-only and bloated HTML. HTML itself cost nothing; what it carried in did.
Read articleDeliverability
Your SPF record says permerror because it needs more than 10 DNS lookups. Here is how receivers count them, what each provider costs and the safe fixes.
Read articleDeliverability
How many links can a cold email carry, and which ones get it flagged? We tested shorteners, redirects, IP links and blocklisted domains through a spam filter.
Read articleDeliverability
Google recommends ~all and Microsoft recommends -all. What each tells a receiver, how DMARC treats them, and how to choose without losing forwarded mail.
Read articleCold Email
We ran a badly built cold email through a spam check, fixed it in five rounds and logged the score each time. Removing spam words was the smallest fix.
Read articleDeliverability
Two TXT records starting v=spf1 make SPF fail for all of your mail. How to merge them into one without dropping a sender or changing what the old ones meant.
Read articleDeliverability
How an inbox placement test works: seed lists, Gmail tabs versus spam, reading Authentication-Results, checking blocklists and fixing problems in order.
Read articleCold Email
Spam trigger words rarely sink a cold email alone. Learn how filters weigh words against context, links and reputation, with word categories and rewrites.
Read articleDeliverability
What spam filters read in a cold email, how spam filter scoring works, the phrases worth rewriting and a pre-send checklist for testing a template for spam.
Read articleDeliverability
Most cold email dies before anyone reads it — not because of the copy, but because the sending domain never proved it was allowed to send. Here is the mechanical checklist for that first gate.
Read articleWarmup
New mailboxes that jump straight to volume get filtered within days. Here is a concrete four-week ramp — with daily numbers — and the reasoning behind each stage.
Read articleDNS
Email authentication in plain language: what each record does, what the receiving server actually checks, and the copy-paste starting points for a new sending domain.
Read articleSequences
More follow-ups don't mean more meetings. A four-step sequence with three-day gaps and a single consistent ask outperforms the eight-touch barrage — here is the template and the reasoning.
Read articleAnalytics
Open rate is lying to you, delivery rate measures almost nothing, and the numbers that predict whether your program survives are the ones nobody puts on a dashboard. A field guide.
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