💬 Real talk: Why emails aren’t reaching inboxes?
Deliverability = retention.
In SaaS startups, critical emails simply can’t miss. Yet I often come across questions like “How do I improve deliverability?”, “Why are my emails going to spam?”, and similar. To help answer these, I put together a clear, practical guide to email deliverability best practices specifically tailored for SaaS startups.
From welcoming users, resetting passwords, to sending updates and marketing—deliverability ensures your messages land in the main inbox, not spam. Unlike simple delivery, deliverability reflects whether emails reach the inbox, impacting onboarding, retention, and conversion. Key influences include sender reputation, authentication, bounce and complaint rates, content quality, and user engagement.
1. Domain reputation
Providers evaluate sender reputation primarily at the domain level—this persists even if you change IPs or providers. Signals include spam complaints, bounce rates, sending volume consistency, engagement metrics, and authentication success.
2. Authenticate emails (SPF, DKIM, DMARC)
Set up SPF and DKIM records to verify sending rights and attach cryptographic signatures. Provider filters heavily rely on these. Adding DMARC protects against spoofing.
3. Choose a reliable sending infrastructure
Prefer ESPs or services with strong inbox placement records.
4. Warm up new domains/IPs
Start with low volume and gradually increase. Send to highly engaged users first to build positive signals during the warm‑up phase.
5. Separate transactional and marketing emails
Send transactional emails from a dedicated domain or IP to protect them from the higher-risk marketing traffic.
6. Maintain a clean, opt-in list
Use opt-in only—avoid third-party or scraped addresses. Regularly prune disengaged users and remove hard-bounces.
7. Create relevant, engaging content
Segment content for relevance, use real reply-to addresses (avoid “no-reply”), and include clear unsubscribe options. Quality content boosts engagement and signals value to providers.
8. Monitor deliverability metrics
Track engagement, bounce, and complaint rates. Early detection allows quick remediation.
What’s a “good” deliverability rate?
Over 90% inbox placement is considered very good; 95%+ is excellent. Transactional emails, sent to verified users, should aim for near 100%.
Tools & platforms
- Sidemail: Focused on SaaS, handles authentication, warm-up, and deliverability automatically.
- Mailgun: Developer-focused, with advanced analytics and validation tools.
- SendGrid (Twilio): Widely used, with strong support for both transactional and marketing emails.
- Amazon SES: Cost-effective and scalable, ideal for teams willing to manage setup.
Closing
Deliverability is both art and science. Your users depend on timely, reliable communication, and that depends on your emails hitting the inbox. What’s the biggest deliverability issue you’ve faced so far?
Full article: https://sidemail.io/articles/email-deliverability-best-practices/ https://sidemail.io/articles/email-deliverability-best-practices/
