Most subject lines fail because they are safe, vague, and built by committee. Replace sleepy certainty with a clear promise, a dash of curiosity, or a handshake of relevance. Think like a friend who has one useful tidbit to share, not like a billboard screaming for attention. Specificity beats cleverness when it helps the reader imagine a benefit.
Start with three simple levers: specificity (numbers, timeframes), curiosity (a gap that begs to be closed), and relevance (name, behavior, or recent activity). Combine them sparingly: a number plus a personal hook, or a short tease plus a clear outcome. Keep the subject under 50 characters when possible and pair it with preview text that finishes the thought.
Concrete examples to steal and adapt: "3 quick tricks to double your opens", "How we cut churn by 23% in 30 days", "Last 5 spots for the free audit". Test one emotional angle, one benefit angle, and one curiosity angle in each send so you learn what your audience actually clicks on rather than assuming you know.
Finish with a tiny experiment plan: write three variations, A/B test them, monitor open and downstream metrics, and kill anything that feels generic. Repeat every two weeks. If you rewrite three subject lines right now using the formulas above, you will already be doing better than most senders.
Stop spraying the same email at everybody and expect miracles. Picture your list as a cocktail party full of distinct people: some are window‑shoppers, some are loyal fans, some left early with a half-finished cart. Segmenting is how you stop shouting and start having actual conversations — the kind that get replies, clicks, and sales instead of polite deletes.
Begin with simple, measurable slices: recency (last activity), frequency (how often they engage), and monetary value (RFM). Add lead source and product interest tags, then layer behavioral triggers like product views, cart abandonments, and repeat buyers. Use suppression lists for already-converted offers and create microsegments for high-value customers. Start with three segments and iterate weekly — complexity is earned, not assumed.
Make each segment feel seen: tailor subject lines, preview text, hero images, and the first 50 words of copy to the segment’s mindset. Swap product names and CTAs with dynamic content blocks so one campaign renders like five personalized notes. Run clean A/B tests on subject lines and send times, changing only one variable per test so you actually learn what moves the needle.
Automate thoughtful flows that act like helpers, not harassers: welcome series, cart recovery, post-purchase onboarding, and a graceful win-back for quiet subscribers. Track open rate, click-through, revenue per recipient, and unsubscribe rate by segment. If a cohort goes cold, try a preference center or lower-frequency cadence before pruning — privacy and choice keep your list healthy long-term.
Inbox real estate on phones is tiny and thumbs are the primary navigation tool, so start with a single column and a clear visual path that leads the thumb to action. Use generous padding, predictable flow from top to bottom, and chunked content that can be skimmed with a thumb flick. Place the most important element where thumbs naturally pause.
Make type and controls finger friendly: use at least 16px for body copy and 22–24px for headlines, and make buttons a minimum of 44x44 CSS pixels. Give CTAs breathing room, avoid clustered links, and prefer one dominant button over multiple small choices. Replace complex menus with one obvious action to reduce decision friction.
Design for conversion by keeping copy short and benefit driven, pairing a single clear CTA with concise supporting proof. Use fast, optimized images and progressive disclosure so extra details appear after an initial tap. Experiment with sticky action bars, large actionable cards, and microcopy that matches the subject and preheader to set accurate expectations.
Measure mobile-specific metrics like tap rate, click-to-open for phones, and mobile conversion separately, then run rapid A/B tests on CTA size and placement. Build editable templates that preview on real devices, iterate on one change per campaign, and keep the voice human. When every element is tuned for thumbs, open rates translate into clicks and real revenue.
Email is not broken, the way most people use it is. Replace hope based send schedules with three automated threads that do the heavy lifting: onboard, build trust, and win back the lukewarm crowd. Think of each thread as a tiny salesperson that never sleeps and only asks for a little tuning.
Make these sequences smarter by adding two easy upgrades: segment by first interaction and personalize at scale with a handful of tokens and dynamic blocks. A/B test subject lines and the timing of that second email. Use click and open signals to push people into higher intent paths.
Run a 30 day experiment: pick one sequence, watch conversion rate and revenue per recipient, then double down on the top performer. Small, consistent automation wins compound into predictable income without constant manual sends.
Email deliverability isn't mystical — it's mechanical. Think of your emails as VIP invites: if the bouncer (ISPs) can't verify you, you don't get past the velvet rope. Start with the basics: set up SPF, DKIM, and DMARC properly, ensure reverse DNS is tidy, and stop sending from free-mail domains for bulk sends. These few minutes of DNS plumbing save weeks of blacklisting headaches.
Next, treat your list like a guest list, not a fishing net. Use double opt-in, prune cold addresses older than 12 months, and segment by recent engagement. When someone hasn't opened in a while, try a short re‑engagement series with a clear CTA — if they still ignore it, remove them. Lower volume to new segments at first to avoid sudden reputation hits and honor bounces immediately so ISPs see you care.
Content matters as much as credentials. Craft subject lines that sound human, avoid spammy words and excessive punctuation, and keep images-to-text balanced. Personalization should be real (behavioral cues, not just a first name), and provide a plain-text alternative. Also, control your send cadence: predictable, measured sends build positive engagement signals; erratic blasts look like spam campaigns.
Finally, measure like a scientist. Seed your campaigns to monitoring inboxes, watch deliverability and engagement rates, track complaints and soft bounces, and iterate weekly. If a campaign tanks, pause, diagnose headers and links, and try again. Deliverability is incremental: small fixes compounded over time turn your messages from spam fodder into VIP passes that land in primary inboxes.
Aleksandr Dolgopolov, 18 December 2025