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How to Protect Your Email Domain and Maximize Deliverability in Outbound

25 April, 2025

7 min read

Email deliverability is critical—45% of inside sales depends on it. Yet many teams neglect the fundamentals. Top campaigns hit 60%+ open rates; weak ones barely reach 10%. The difference? Domain protection, not clever subject lines.

Our goal: help you maintain 95-98% deliverability with authentication (SPF, DKIM, DMARC), clean lists, and smart sending patterns—so sales teams can focus on closing deals, not fixing email problems.

Build a Trusted Domain & Sending Reputation

Clean Domain & Warming

  • Start 20-50 emails/day

  • Gradually increase by 10-15%/week

  • Target engaged recipients first

  • Warm up over 3-6 weeks

Dedicated or Rotated Senders

  • Use dedicated IPs for 25K+ daily emails

  • Rotate accounts to mimic natural behavior—30-40% better deliverability

Craft Emails That Get Delivered & Opened

Plain Text or Light HTML

  • Higher deliverability than image-heavy HTML

  • Maintain healthy text-to-image ratio

Personalize Subject Lines & Content

  • Personalized subject lines = 26% higher open rates

  • Go beyond {FIRSTNAME}—reference behavior, dates, location, transaction history

Avoid Spam Triggers & Excessive Links

  • No more than 3-5 links

  • Avoid trigger words ("FREE!!!", "buy now", "urgent")

Maintain a Healthy & Engaged List

Validate Before Sending

  • Keep bounce rates <0.5%

  • Real-time validation removes invalid/spam trap emails

Double Opt-In & Easy Unsubscribe

  • Build lists of engaged humans

  • Obvious unsubscribe link reduces spam complaints

Segment by Engagement & Intent

  • Segmented campaigns = 14.3% higher opens, 101% higher clicks

  • Segment on recency, frequency, intent signals

Monitor Performance & Automate Fixes

Key Metrics to Track

  • Bounce rate <2%

  • Spam complaints <0.1%

  • Open rates: top = 40%, avg. = 21.5%

Use Testing Tools

  • Mail-Tester: message structure & setup

  • GlockApps: real inbox placement across 70+ mailboxes

Stay Off Blacklists & Follow Laws

  • Authenticate (SPF, DKIM, DMARC)

  • Maintain clean lists

  • Monitor for blacklisting proactively

Conclusion

Email deliverability is foundational. Proper domain warm-up, clean lists, and solid authentication aren't optional—they're what separates top sales teams from those shouting into spam folders. With strong fundamentals, your brilliant messages will actually reach prospects.

FAQs

Q1. How to improve email deliverability?

Authenticate (SPF, DKIM, DMARC), warm gradually, monitor reputation, validate emails, use double opt-in, easy unsubscribe, and avoid purchased lists.

Q2. Why is domain reputation important?

It determines inbox vs. spam placement—good reputation = better reach.

Q3. How does content impact deliverability?

Plain text/light HTML, personalization, avoid spam words, limit links.

Q4. What role does list hygiene play?

Validating and segmenting reduces bounces & spam, boosting reputation.

Q5. How to monitor & improve performance?

Track bounces, spam, opens. Use tools like Mail-Tester & GlockApps. Stay off blacklists. Constant monitoring = fast fixes.