Email Marketing 101: Sequences, Broadcasts, Open Rates

What is email marketing?

Email marketing is the practice of staying in touch with people who gave you their address — turning a one-time signup into an ongoing relationship. Welcome emails when someone joins. Onboarding sequences over the first week. Upsell prompts when they're ready for more. Broadcasts to keep your list warm.

For founders, email is the highest-ROI channel by a wide margin. Open rates that beat social platforms (15–30% on email vs. 1–3% reach on social). Direct delivery into someone's attention without an algorithm deciding whether to show it. And — critically — you own the list. If Twitter bans you tomorrow, your email list still works.

The reason most founders' email is bad: they treat every email like a newsletter. The right approach is to think in purpose. Welcome emails build trust. Onboarding emails activate users. Upsells drive revenue. Broadcasts keep you top of mind. Each one has a different job.

What VibeFlow's Email agent gives you

• Welcome sequence (3 emails) — what someone gets in their first 24 hours. Confirms their signup, sets expectations, gets them to take their first action.
• Onboarding sequence (7 days) — daily or every-other-day emails for the first week. Each one teaches one specific thing that gets the user closer to value.
• Upsell sequence (5 emails) — for paying customers who could benefit from a higher tier. Each email focuses on a single benefit.
• Re-engagement / win-back (3 emails) — for users who signed up but never came back. Different from a broadcast — these are targeted at people who went cold.
• Broadcast emails — one-off updates: feature launches, blog posts, product news.

For every email: subject line variants (3–5 options to A/B test), preview text, body copy, CTA button, P.S. line.

Tools you'll work with

You need an email platform to actually send. Pick one based on your stage:

• Resend — developer-friendly, transactional + marketing. What VibeFlow uses for our own auth emails. Best for technical founders.
• ConvertKit / Kit — creator-focused. Great visual sequence builder, fair pricing. Best for newsletter-heavy use.
• Mailchimp — the default option most founders default to. Fine, not optimal. Decent free tier.
• Customer.io — event-triggered emails for SaaS. Higher complexity, higher power.
• Loops — newer player, very founder-friendly, increasingly popular for SaaS.

VibeFlow doesn't send emails for you — we generate the copy, you paste into your platform of choice.

Getting started: your first three email moves

1. Set up a welcome sequence (3 emails). Even if you have zero users today, this is the foundation. The Email agent generates the full sequence based on what your product does.
2. Write one broadcast email about why you're building what you're building. Send it to anyone in your network who's expressed interest. This is the email that turns "huh, cool" into "tell me more."
3. Pick one weekly cadence. Many great indie founders send one "what shipped this week + what I'm thinking about" email every Friday. Pick a day and rhythm; consistency beats volume.

Common mistakes to avoid

• Sending too much. Daily emails work for some lists. Most founders' lists hate it. Start at once a week, scale up only if engagement says yes.
• Spammy subject lines. "Don't miss out!!" "Last chance!!" — these get sent to the spam folder by Gmail's filters before a human ever sees them. Write subject lines like you'd write a friend.
• No personalization beyond the name. Hi {firstName} is the lowest bar of personalization. Better: reference what they actually did (signed up Wednesday, hasn't completed onboarding step 2, etc.). Many email platforms support this with conditional content.
• Burying the CTA. Every email should have one clear action. Not three. Not five. One.
• Not warming up a new sending domain. If you switch email platforms, your new sending domain has zero reputation. Send small volumes first, scale up over weeks. Otherwise: spam folder.
• Ignoring deliverability basics. SPF, DKIM, and DMARC records on your domain are non-negotiable. Your email platform will tell you exactly what DNS records to add — do it before sending a single email.

Glossary

• Open rate — % of recipients who opened the email. 20–30% is healthy.
• Click rate — % of recipients who clicked a link in the email. 2–5% is healthy.
• Bounce rate — % of emails that couldn't be delivered. Keep under 2% to avoid being flagged.
• Deliverability — whether your emails land in the inbox vs. spam. Driven by DNS records, sending reputation, and content.
• Sequence — a series of emails triggered by an event (signup, purchase, etc.) and sent in a specific order over time.
• Broadcast — a one-off email sent to your list. No automation.
• List hygiene — periodically removing inactive subscribers so your engagement metrics stay healthy.
• SPF / DKIM / DMARC — DNS records that prove your emails are actually from your domain. Required for deliverability.

FAQ

How big does my list need to be before email is worth it? Email is worth it at 10 subscribers. The habit of writing for your audience starts before scale matters.

Should I send HTML or plain text emails? Plain-text or very-lightly-styled emails outperform HTML-heavy designs on open and reply rates. They feel like a real person wrote them.

What's a good subject line? Specific, curious, and short. "I shipped Vibe Tweak today" beats "Exciting new feature announcement."

What to do next

Open the Email agent in your dashboard and generate your welcome sequence. Three emails. Paste them into your email platform's automation, set the trigger to "new signup," and you're done.