If your HubSpot emails are ending up in spam folders, or your bounce rates have started creeping up, you’re chasing a bigger issue: a damaged sender reputation. And once inbox providers begin distrusting your domain, every email campaign struggles—lower opens, fewer clicks, and disappointing conversions.
You’re not alone. Many marketing and RevOps teams hit this wall after list hygiene gets overlooked, automated workflows over-send to disengaged contacts, or domain setup isn’t fully authenticated. And the hardest part? Pinpointing what broke. Was it poor engagement, expired lists, a missing SPF record, or too many emails too soon after a long pause?
This guide walks you through finding the root cause, using HubSpot’s built-in tools to repair your reputation, and maintaining lasting deliverability. By the end, you’ll have a clear roadmap to rebuilding inbox trust—one campaign at a time.
How to Fix a Damaged Sender Reputation in HubSpot
Repairing your HubSpot email sending reputation is less about quick fixes and more about earning trust back—both from ISPs and your own contact lists. It starts with proper authentication, continues with cleaning your data, and works only if your emails receive solid engagement.
Inside HubSpot, your reputation is directly linked to your email health score under Marketing > Email > Health. This score reflects real-time engagement metrics like opens, click-through rates, hard bounces, unsubscribes, and spam complaints.
When your performance trends downhill, reputation repair means stopping any risky sends, cleaning your contact base, and gradually reintroducing messages to only the people most likely to respond. The process blends CRM list quality, technical domain setup (SPF, DKIM, and DMARC), and well-designed content strategies that encourage interaction.
To manage this in HubSpot, you’ll lean on the platform’s native tools:
- Email Health Dashboard to flag issues early
- Email Settings to control sender authentication and types
- Workflows that automate re-engagement or suppression
- Custom Reports to measure progress with real data
How It Works Under the Hood
There are three key mechanisms driving your email reputation in HubSpot: engagement data, domain-level authentication, and send cadence. Each one feeds into how HubSpot—and the inbox providers your emails are sent to—judge your sender trust.
You’re sending from a domain with certain authentication (SPF/DKIM). Your list has a history of opens—or not. And your campaigns generate signals with every send (bounces, clicks, unsubscribes). HubSpot captures it all through its internal sender health algorithm.
Here’s how that plays out:
- List quality and engagement affect your health score daily
- High bounce or spam complaint rates trigger a reputational downgrade
- Low opens or click-throughs reduce your credibility over time
- Improvements get noticed, too—but only if they’re sustained
Use features like Send Frequency Safeguard to limit emails to disengaged contacts, and set up subscription types that reflect actual user preferences. These touches make a measurable difference when you’re trying to recover.
And that SPF and DKIM? Those aren’t optional. Without them, inbox providers have no way to know that HubSpot is permitted to send emails on your behalf. In the absence of authentication, even your best message can land straight in the junk folder.
Main Uses Inside HubSpot
Rebuilding Domain Trust
You’ll know your domain trust is slipping when open rates fall below your norm, or complaints creep up. HubSpot’s deliverability tools help you pause, reassess, and start rebuilding.
Take this practical example: Say your team halts all bulk sends for two weeks. You segment out unengaged contacts, launch a re-engagement drip, and message only recipients who show interaction. That restraint works in your favor—HubSpot detects improving rates, and inbox providers see cleaner signals. And that’s the foundation of trust you need to earn back.
Monitoring Ongoing Deliverability Improvement
Your repair plan is only valuable if you track what’s changing and why. HubSpot lets you monitor reputation metrics in real time across campaign types—newsletters, promotions, and transactional messages.
One team used a dashboard powered by the Email Performance report. They set alerts for campaigns with hard bounce rates over 2%, helping them sidestep audience risks before damage occurred. That data-first discipline improves your send quality over time.
Supporting CRM Data Quality
Healthy sending outcomes depend on healthy contact data. When your CRM holds old, invalid, or disengaged contacts, even the best content won’t deliver reliable results.
A great habit? Schedule automated workflows to review engagement quarterly. One RevOps team created a flow that flagged everyone who had been inactive for 6 months. By tightening that list and removing bouncers, performance rose, and HubSpot measured tangible improvements to deliverability. Smaller list, better results.
Common Setup Errors and Wrong Assumptions
Sending to outdated or purchased lists
Those addresses often bounce, complain, or ignore you.
→ Fix: Use HubSpot’s health dashboard to isolate those contacts, then exclude or delete.
Skipping authentication setup (SPF/DKIM)
Without verification, inboxes question if you’re a spammer.
→ Fix: Go to Settings > Domains & URLs, and double-check your DNS records are properly configured.
Sending high volumes too quickly after inactivity
Even if you’re eager to hit GO, ISPs see it as suspicious behavior.
→ Fix: Start with small sends to your most engaged users. Monitor, then ramp.
Treating soft bounces as minor
When they repeat, they signal deeper deliverability issues after all.
→ Fix: Analyze patterns in bounce reports. Cut contacts that fail repeatedly.
Step-by-Step Setup or Use Guide
Before launching your repair plan, confirm this checklist:
- Your sending domain is authenticated
- Your email addresses were collected through permission-based channels
- You have access to HubSpot email health and admin settings
Step 1:
Navigate to Settings > Marketing > Email > Health. Check if your sender score is good, warning, or poor.
Step 2:
Under Domains & URLs, confirm that your domain is verified. SPF and DKIM must be greenlit. If not, update your DNS records with your provider.
Step 3:
Segment your CRM. Build:
- An “Engaged” list: opened or clicked in the last 90 days
- An “Unengaged” list: no activity for six months or more
Step 4:
Pause all high-risk sends. This includes old newsletter lists or cold leads. Focus on your engaged audience only.
Step 5:
Launch a re-engagement campaign:
- Trigger: Contacts flagged as inactive
- Send a concise, value-based message asking for continued interest
- If no response after two touches, suppress or remove
Step 6:
Monitor daily activity in your Email Performance dashboard. Key metrics: open rate, click rate, bounces, and complaints.
Step 7:
Over the next three to four weeks, increase send volumes carefully. Add engaged contacts in small groups. Don’t rush this.
Step 8:
Use Custom Report Builder to track improvement trends. Compare your engagement before and after the repair cycle.
Measuring Results in HubSpot
You’ve put in the work—now it’s time to see if it paid off. HubSpot makes this visible across a few key views.
To evaluate your progress:
- Check the Email Health Overview for an improved sender score
- Look for rising open rate trends; those show you’re landing in more inboxes
- Bounce rates dropping means cleaner lists
- Spam complaints falling confirm your content and targeting are working
- The Domain Performance Report validates that things are technically sound
If you want a sharper view, build a dashboard focused on:
- Open rates for re-engagement journeys and general sends
- Unsubscribe rate trends, updated weekly
- Bounce or complaint spikes tied to specific audience types
Maintain a baseline for 30 to 45 days with stable performance. That’s your green light to resume normal sending levels. For future prevention, revisit these reports quarterly.
Short Example That Ties It Together
Here’s how a marketing ops team turned things around: After a string of low-performing emails, their HubSpot health score dropped to “poor.” Their domain was correctly authenticated, but their contact list hadn’t been pruned in nearly two years. They cleaned it up, isolating only those who’d clicked or opened anything in the last 90 days. They also paused all blasts, introduced a re-engagement series using workflows, and watched the metrics.
Within six weeks, their opens climbed back into normal range, bounce rates dropped, and complaints vanished entirely. HubSpot recognized the positive signals and returned its sender score to “healthy.” They baked monthly list reviews into their new workflow—and never looked back.
How INSIDEA Helps
Maintaining your email reputation takes ongoing effort. INSIDEA works with marketing and RevOps teams to fine-tune HubSpot email systems, improve CRM data quality, and build automation flows that protect your sender health long term.
Here’s where INSIDEA helps:
- Complete HubSpot onboarding, including domain setup and verified sender configuration
- In-depth audits and phased deliverability repair plans
- Automated workflows for managing disengaged contacts
- Custom dashboards and reports for measuring send health
- Contact database cleanup, field standardization, and quarterly maintenance workflows
If your email reputation feels unreliable—or you’re solving the same deliverability problems over and over—INSIDEA can help you reset and lock in a smarter, lasting system. Check out INSIDEA’s HubSpot consulting services or connect with one of our specialists.
