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plugHow to Fix Deliverability Issues Without Replacing Your Delivery Service Provider

Struggling with deliverability? Improve inbox placement without switching your email service provider using these practical fixes.

You’re committed to your current Delivery Service Provider. Maybe it’s familiar, budget-friendly, or integrated with your CRM. But lately… inbox delivery isn’t what it used to be.

Here’s the good news: you don’t need to switch platforms to fix deliverability. Most issues are caused by poor sending practices — not your Delivery Service Provider.

Let’s walk through how to significantly improve your email deliverability while staying exactly where you are.

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1. ✅ Authenticate Your Domain (Even If You’re Using Shared Infrastructure)

Many users skip SPF, DKIM, and DMARC because they think their Delivery Service Provider handles it all. While Delivery Service Provider can provide default records, custom authentication aligned with your domain builds trust.

How to fix it:

  • Add SPF records that authorize your Delivery Service Provider's IPs

  • Generate DKIM keys through your Delivery Service Provider and add them to DNS

  • Set up DMARC with a "none" policy first, then move to stricter levels

  • Monitor with DMARC reporting tools

Even with Mailchimp, ConvertKit, or ActiveCampaign — custom domain alignment boosts delivery.

Learn more: Understanding SPF, DKIM, and DMARCarrow-up-right

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2. 🧹 Clean Your Email List (Even If It’s Opt-In)

Permission doesn’t equal performance. If you haven’t cleaned your list in 60–90 days, engagement will drop — and so will deliverability.

Clean your list by:

  • Removing invalid or bouncing emails

  • Scrubbing role-based emails (info@, support@, etc.)

  • Segmenting out users who haven’t opened in 60+ days

  • Using verification tools before new imports

📌 A smaller, cleaner list performs better than a large, cold one.

Related guide: Maintaining a Healthy Subscriber Base

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3. 💬 Segment by Engagement and Relevance

One-size-fits-all email blasts are outdated — and dangerous.

Instead:

  • Group users by last open/click activity

  • Tailor content to user behavior

  • Reduce frequency to cold/unengaged segments

  • Run re-engagement campaigns before removing users

🔹 Engagement signals help build sender reputation — even within shared IP pools.

Need help with this? Read: Email List Segmentation Strategies

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4. ✍️ Fix Your Email Content

Email content can make or break your inbox placement.

Common problems:

  • Spam trigger words ("free", "act now")

  • Image-heavy or flashy HTML

  • Broken links or code

  • No plain-text fallback

Best practices:

  • Write conversational, value-focused copy

  • Balance image-to-text ratios

  • Test with spam-check tools

  • Always include a plain-text version

Related blog: Avoiding Spam Filters

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5. ♻️ Use Variation — Even Without Automation Tools

If your Delivery Service doesn’t offer rotation, you can still vary elements manually:

  • Change subject lines across campaigns

  • Vary CTAs and intros

  • Personalize sender name or reply-to address

📅 Gmail’s filters evolve. Variation keeps your emails out of bulk folders.

Automation idea: Using Smart Rotation

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6. 🧠 Monitor the Right Metrics (Not Just Open Rate)

Open rates help, but you need a fuller picture. Track:

  • Hard/soft bounces

  • Spam complaint rate (< 0.1%)

  • Domain reputation (via Gmail Postmaster)

  • Inbox placement (use SenderWiz or GlockApps)

Pro tip: Add a seed inbox to your list and check daily placement results.

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7. ⛔️ Avoid Dangerous Delivery Service Provider Defaults

Some Delivery Service Provider defaults seem helpful but hurt your delivery:

  • ❌ Auto-resends to non-openers

  • ❌ Blasting your full list every time

  • ❌ Non-segmented or untargeted emails

  • ❌ Templates with excessive formatting

Use Delivery Service Provider features strategically — not blindly.

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📊 Summary: 7 Ways to Improve Without Switching Platforms

Area
Fix

Domain Auth

Set up SPF, DKIM, DMARC for custom domain

List Hygiene

Verify, clean, and segment inactive emails

Content

Simplify, personalize, avoid trigger words

Variation

Rotate subject lines and sender info

Metrics

Monitor bounce, spam, placement

Segmentation

Group by behavior and re-engagement

Delivery Service Provider Settings

Turn off harmful defaults like auto-resends

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🔮 Final Thoughts: Your Delivery Service Provider Isn’t the Enemy

Most inbox issues stem from sender behavior — not the platform.

📌 Before you jump ship, optimize how you send:

  • Clean your list

  • Personalize your content

  • Authenticate your domain

Want more control? Try integrating SenderWizarrow-up-right for rotation, warmup, inbox testing, and cold outreach compliance — all while keeping your current Delivery Service Provider.

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