Blog
Lifecycle email playbooks for SaaS teams
Practical, founder-facing writing on lifecycle email, product event tracking, onboarding, and retention. No fluff, no spray-and-pray advice. Just how to send the right message when a user actually does something in your product.
PostHog vs Iterable: analytics-native sends or an enterprise platform?
PostHog Workflows sends triggered lifecycle email from inside your analytics tool. Iterable is quote-based enterprise software. Who actually needs which, in 2026.
August 17, 2026 · 9 min read
ComparisonPostHog vs Vero: two developer-first ways to send behavioral email
Both trigger email off product events. One lives inside your analytics tool, one is a dedicated messaging system. How to pick in 2026.
August 17, 2026 · 9 min read
ComparisonPostHog vs Klaviyo: why SaaS teams keep bouncing off an ecommerce tool
Klaviyo is the best tool in the world for ecommerce and a poor fit for B2B SaaS. PostHog Workflows assumes product events. Where each one wins in 2026.
August 17, 2026 · 9 min read
ComparisonPostHog vs HubSpot: product events or CRM state?
PostHog Workflows triggers on product events you already track. HubSpot automates off CRM state, from a Professional tier. Fit and cost for 2026.
August 17, 2026 · 9 min read
ComparisonCustomer.io alternatives for small teams: what actually costs less
Customer.io's Essentials plan floors at $100/mo before you send a single email. What teams under five actually pay with Loops, Userlist, Encharge, Bento, Brevo, and GetFluxly.
August 3, 2026 · 8 min read
GuideEvent-based email automation tools: the 2026 rundown for SaaS teams
Event-based email automation triggers on what people do, not a calendar. The top event-triggered tools compared for SaaS, ecommerce, and enterprise in 2026.
August 3, 2026 · 10 min read
GuideAI email marketing tools for SaaS in 2026: what the AI actually does
Most lists blur four different AI features into one buzzword. What GetFluxly, Customer.io, Klaviyo, and Brevo's AI actually does in 2026, tool by tool.
August 3, 2026 · 10 min read
GuideResend domain verification: every DNS record, explained
Each DNS record Resend asks for: SPF, the three DKIM CNAMEs, MX, tracking, and DMARC, plus the reasons verification stalls and how to fix them.
July 29, 2026 · 7 min read
GuideHow to verify Resend webhook signatures with Svix
The svix-id, svix-timestamp, and svix-signature headers, the whsec_ secret, working Node.js verification code, and the retry rules that follow.
July 29, 2026 · 7 min read
GuideReceiving email with Resend: inbound setup, webhooks, and gotchas
Resend inbound email, explained: the managed resend.app address, custom-domain MX setup, the email.received webhook, and the metadata-only gotcha.
July 29, 2026 · 7 min read
ComparisonPostHog vs Customer.io: which behavioral email setup fits your SaaS?
PostHog Workflows is now GA. When it covers your lifecycle email, when you need Customer.io's journey builder, and what each costs in 2026.
July 29, 2026 · 8 min read
ComparisonBrevo vs Customer.io: broad channels or deep behavioral email?
Brevo is affordable multichannel marketing. Customer.io is deep event-driven automation from a $100/mo floor. How to choose in 2026.
July 29, 2026 · 8 min read
ComparisonKit (formerly ConvertKit) vs GetResponse: creator OS or all-in-one suite?
Kit vs GetResponse in 2026: creator commerce and simplicity against webinars, funnels, and deeper automation. Pricing and honest verdicts.
July 29, 2026 · 8 min read
ComparisonCustomer.io vs Klaviyo: pick by what your revenue looks like
Klaviyo owns ecommerce and Shopify. Customer.io owns product-event messaging for SaaS. The 2026 comparison, including both billing gotchas.
July 29, 2026 · 8 min read
ComparisonDrip vs Kit (formerly ConvertKit): store emails or creator emails?
Drip is ecommerce automation on store data. Kit is creator monetization. Pricing, automation depth, and who should pick which in 2026.
July 29, 2026 · 8 min read
ComparisonCustomer.io vs HubSpot: product events or CRM state?
Customer.io triggers on real product events. HubSpot automates off CRM state, with a CMS and pipeline attached. Cost and fit, compared for 2026.
July 29, 2026 · 8 min read
ComparisonLoops vs Customer.io: how much email tool does your SaaS need?
Loops is simple, fast, and email-only. Customer.io is deep, multi-channel, and heavier. Where the crossover point is for SaaS teams in 2026.
July 29, 2026 · 8 min read
OnboardingOnboarding emails that react to what people do
Calendar-based onboarding sequences nag people about steps they already finished. The event-triggered onboarding sequence we run on GetFluxly, email by email.
July 28, 2026 · 6 min read
TrialsTrial conversion emails that work before day 14
Trial emails that fire on day numbers miss the moment. The behavior-triggered trial conversion sequence we run on GetFluxly, from first value to expiry.
July 28, 2026 · 5 min read
RetentionWinback emails that start before the cancel button
Winback usually begins after the cancellation. Ours starts when usage goes quiet: the signal-driven winback sequence we run on GetFluxly.
July 28, 2026 · 6 min read
BillingFailed payment recovery emails for SaaS
Card declines churn customers who never chose to leave. The dunning sequence we run on GetFluxly: retries, tone, and when a human steps in.
July 28, 2026 · 6 min read
ComparisonPostHog and lifecycle email: what it covers and what to pair it with
PostHog is product analytics with an early Messaging beta. For behavioral and lifecycle email, teams pair it with an email platform or use one tool for both.
July 21, 2026 · 8 min read
AnalyticsEmail event tracking: a practical guide
Email event tracking means two things: events about your emails (delivered, opened, clicked, bounced) and product events that trigger emails. A guide to both.
July 21, 2026 · 7 min read
EngineeringThe Resend DKIM selector, explained
Resend's DKIM selector is resend._domainkey, a TXT record you copy from the dashboard. Here is the full DNS setup, plus SPF and why verification stalls.
July 21, 2026 · 6 min read
EngineeringResend API keys: full access vs sending access
Resend offers two API key levels: full access (admin) and sending access (send only). Sending keys can be domain-restricted. Here is which to use where.
July 21, 2026 · 4 min read
ComparisonTransactional email providers compared: Resend, Postmark, SendGrid, AWS SES, and Mailgun
Resend, Postmark, SendGrid, AWS SES, and Mailgun compared on pricing, deliverability, developer experience, and webhooks, by a team that connects to all five.
July 19, 2026 · 9 min read
EngineeringResend webhooks: a practical guide to events, verification, and retries
A practical guide to Resend webhooks: the full event list, a real payload, verifying the Svix signature correctly, idempotency, and retry behavior.
July 19, 2026 · 8 min read
TransactionalMagic link emails: best practices from building our own
We run email-first, magic-link sign-in at GetFluxly. Lessons on subject lines, expiry, single-use tokens, link scanners, and when to skip magic links.
July 18, 2026 · 7 min read
AnalyticsHow to measure user activation in your SaaS
Activation is the metric most teams define wrong. How to find your activation event from your own retention data, without a data team or fake benchmarks.
July 18, 2026 · 7 min read
DeliverabilitySPF, DKIM, and DMARC for SaaS founders, in plain English
SPF, DKIM, and DMARC explained for a founder with 30 minutes and one domain: the DNS records, the p=none to p=reject path, and the footguns to avoid.
July 18, 2026 · 8 min read
TransactionalPayment receipt emails for SaaS: best practices
A SaaS receipt is a trust document, not a marketing surface. What to include so it is verifiable, tax-ready for the EU, and never triggers a chargeback.
July 17, 2026 · 7 min read
AnalyticsResend email analytics: how to track opens, clicks, and what comes after
Resend gives you delivery events plus open and click tracking. The harder question is what happens after the click. How to measure email through to activation.
July 17, 2026 · 7 min read
ComparisonResend vs Loops (loops.so): which one does your SaaS need?
Resend is sending infrastructure with an API. Loops (loops.so) is a marketing and lifecycle email product. Which one your SaaS needs, compared honestly.
July 17, 2026 · 7 min read
AnalyticsWhich events to track in your SaaS (start with twelve, not two hundred)
Most SaaS teams track too much and trust none of it. A decision-first method and a twelve-event starter set that ties every event to a metric you will use.
July 16, 2026 · 7 min read
TransactionalPassword reset email best practices for SaaS
A password reset email has one job: get a locked-out user back in fast. How to write the subject, place the link, set the expiry, and reach the inbox.
July 16, 2026 · 7 min read
ComparisonResend vs Postmark for SaaS transactional email
Resend and Postmark are both excellent for SaaS transactional email. A practitioner comparison of developer experience, deliverability, pricing, and streams.
July 16, 2026 · 7 min read
TransactionalIs a welcome email transactional or marketing?
Is a welcome email transactional or marketing? It depends on what it contains. A practical test, what CAN-SPAM and GDPR require, and how to build yours.
July 15, 2026 · 6 min read
AnalyticsHow cookieless analytics actually works
Cookieless analytics identifies visitors with a server-side hash of IP and user agent, not a browser cookie. How the mechanism works and what it trades away.
July 15, 2026 · 8 min read
AnalyticsEvent tracking naming conventions that survive your next hire
Event naming is cheap to get right on day one and expensive to fix at event 200. One grammar, snake_case, past tense, and variants in properties, not names.
July 15, 2026 · 7 min read
UpsellSend an email when a user hits their usage limit
A usage limit is one of the highest intent moments in your product. How to send a behavior triggered usage limit email that converts to an upgrade without feeling like a shakedown.
July 1, 2026 · 7 min read
Build vs buyBuild vs buy lifecycle email: the plumbing nobody warns you about
Building your own lifecycle emails feels cheaper than Customer.io. The branching is a weekend, the identity stitching, exit races, and dedup quietly eat months.
June 23, 2026 · 6 min read
PillarLifecycle email automation for SaaS: the complete guide
What lifecycle email automation actually means for SaaS, why drip sequences fall short, and how to cover every stage from onboarding to win back with behavior triggers.
June 20, 2026 · 9 min read
EventsProduct event tracking for email automation
Event tracking content is written for analytics buyers. This guide is for founders who want email triggers: what events to track, how to name them, no CDP required.
June 20, 2026 · 8 min read
RetentionEmail automation to reduce SaaS churn
Churn shows up in your data before it shows up in your dashboard. How to use behavior triggered email to catch at risk SaaS users before they cancel.
June 20, 2026 · 8 min read
OnboardingSaaS onboarding email sequence: behavior triggered, not timer dripped
An onboarding sequence on day numbers emails people about things they already did. How to build one that adapts to what the user has and has not done.
June 19, 2026 · 8 min read
TrialsSaaS trial conversion email sequence: two tracks, one goal
Trial emails built around day numbers fail both your activated and your stalled users. How to run two behavior keyed tracks that convert more trials to paid.
June 19, 2026 · 8 min read
RetentionWin-back email campaign SaaS: re-engagement vs win-back
A win back campaign is not the same as a re engagement sequence. One targets quiet subscribers, the other targets cancelled users. Timing and segmentation decide both.
June 18, 2026 · 8 min read
Lifecycle emailTools with both transactional and marketing email (one-platform guide)
Which tools handle both transactional and marketing email, compared side by side, plus how one shared customer profile keeps receipts and campaigns in sync.
June 18, 2026 · 7 min read
BillingDunning email sequence: recover failed payments
Failed payment recovery is the highest ROI email most SaaS teams never set up. The mechanics of when to retry, when to email, and how the sequence should run.
June 17, 2026 · 7 min read
ActivationUser activation email SaaS: trigger on the aha moment
The activation milestone trigger specifically, not generic onboarding. How to find your aha event and fire the one email that pulls users to value.
June 17, 2026 · 7 min read
FreemiumEmail sequences for SaaS free tier users
Most free tier email sequences nag. How to move freemium users to paid with email that fires on limits and signals that predict upgrade intent.
June 17, 2026 · 7 min read
MetricsHow to measure email automation ROI for SaaS
Opens and clicks are vanity metrics. How to measure email automation ROI for SaaS using activation rate, trial to paid lift, and revenue influenced.
June 16, 2026 · 7 min read
Lifecycle emailSaaS email automation without a developer
Non technical solo founders can run behavior triggered email without writing SQL or asking an engineer. The minimal setup and what is self serve from there.
June 16, 2026 · 7 min read
StrategyEvent-triggered vs time-based emails: which converts better
Event triggered emails respond to what users do. Time based emails fire on a schedule. When each one wins, and why a hybrid usually beats both for SaaS.
June 15, 2026 · 7 min read
BillingHow to write a failed payment email that doesn't sound like a debt collector
A failed payment email should recover revenue, not end the relationship. The tone, copy, and CTA that actually gets cards updated, with templates.
June 15, 2026 · 7 min read
StrategyEmail marketing for bootstrapped SaaS: what to build first
Solo and tiny teams cannot build every sequence at once. How to prioritize the automations that earn their keep earliest and skip the rest for now.
June 14, 2026 · 7 min read
StrategySaaS email automation checklist: what to set up first
A concrete checklist of the tracking and lifecycle emails to set up first, in order, for a launching SaaS.
June 14, 2026 · 8 min read
OnboardingReduce time to value with onboarding emails
Onboarding email is measured on opens. The metric that matters is time to value. How behavior triggered email shortens the path to first value.
June 14, 2026 · 7 min read
StrategyProduct-led growth email strategy: the missing half of PLG
Most PLG motions skip email entirely. How to use product signals and product qualified leads to trigger the right message in a self serve funnel.
June 13, 2026 · 8 min read
OnboardingSaaS welcome email examples: do exactly one job
The welcome email is the highest open email you will ever send. Use that moment to pull the user to one activating action, with examples.
June 13, 2026 · 7 min read
RetentionRe-engagement email examples for SaaS
Examples and templates for waking up users who are quiet but still subscribed. Distinct from win back, which targets cancelled users.
June 12, 2026 · 7 min read
ActivationAbandoned signup email for SaaS: trigger off the missing event
The signup that stalled before activation is your most recoverable user. How to trigger a nudge off the missing activation event, not a timer.
June 12, 2026 · 7 min read
StrategyHow often to email SaaS users: cadence by lifecycle stage
Cadence should follow lifecycle stage and behavior, not a fixed weekly schedule. How to pace sends and avoid fatigue at every stage.
June 11, 2026 · 7 min read
DeliverabilityEmail deliverability for SaaS: a founder's guide to inbox placement
SPF, DKIM, DMARC, sender reputation, list hygiene, and why behavior triggered sending is your best deliverability defense.
June 11, 2026 · 8 min read
SegmentationBehavioral segmentation for email: segment by what users do
Demographic segments give you buckets. Behavioral segments give you intent. Concrete behavioral segments and the email each one should trigger.
June 11, 2026 · 7 min read
ExpansionSaaS upsell email: trigger expansion on usage signals
Expansion revenue is cheaper than acquisition. Trigger upsell emails on usage signals like limit reached, power usage, and seat growth.
June 10, 2026 · 7 min read
DeliverabilityTransactional email best practices for SaaS
Transactional emails are your most opened, most trusted messages. How to make them work harder, and the honest line between transactional and marketing.
June 10, 2026 · 7 min read
Lifecycle emailFeature adoption emails: a triggered playbook
Most feature launch emails blast the whole list at once. Here is how to write triggered, segmented feature adoption emails that drive real usage.
June 10, 2026 · 7 min read
AnnouncementGetFluxly private beta opens this week
The GetFluxly private beta opens Monday, May 25, 2026. Three months free, full platform access, no card on file. What is shipping, who it is for, and how to get in.
May 19, 2026 · 4 min read