If your emails consistently land in spam folders, your entire marketing strategy suffers—no clicks, no conversions, no progress.
The truth is, most email performance drops aren’t caused by destructive content; they’re rooted in hidden deliverability issues: improper domain setup, poor list hygiene, and misaligned sending practices.
While HubSpot is built with infrastructure designed to support deliverability, many teams overlook the very tools built to protect sender reputation and inbox placement.
This practical guide walks you through how to improve email deliverability inside HubSpot, using the platform’s native tools and settings.
You’ll understand how to make sense of your deliverability data, how to properly structure your setup, and where INSIDEA can help ensure reliability across your email workflows.
What Improving Email Deliverability with HubSpot’s Tools is in HubSpot
In HubSpot, email deliverability isn’t a single feature—it’s the outcome of multiple settings working together behind the scenes to help you reach your recipients’ inboxes.
You manage deliverability through the Marketing Hub, where critical controls are located inside “Marketing Email” settings. Additional features are available under the “Domain Settings,” “Subscription Preferences,” and “Email Health” dashboards.
These tools collaborate to authenticate your domain, monitor sender activity, evaluate list quality, and quickly surface red flags.
HubSpot automatically handles backend operations like send throttling, bounce categorization, and IP pool management. It also tracks compliance with email governance laws like CAN-SPAM and GDPR by aligning each contact’s permissions with your email types.
You’ll also get assistive help from HubSpot’s AI features that optimize send times, score contact quality, and predict engagement.
These features don’t directly modify deliverability, but they help you send smarter—reducing low engagement and avoiding reputation damage.
How it Works Under the Hood
Email deliverability in HubSpot depends on both your system configuration and your audience’s behavior. A breakdown of the core components:
Domain Authentication
Start here. When you verify your domain through “Settings > Domains & URLs,” HubSpot gives you DKIM and SPF DNS records to publish. Doing this confirms to inbox providers (think Gmail or Outlook) that HubSpot is authorized to send on your behalf. Without it, you risk being flagged as spam due to domain spoofing.
Reputation Scoring and Compliance Checks
HubSpot monitors your bounce rates, spam complaints, and engagement. As those metrics shift, your domain’s reputation responds in kind. If things dip too far, HubSpot can automatically throttle or pause sending to protect inbox trust.
Send Infrastructure
Most users send from HubSpot’s shared IP pools, which carry aggregated reputations. If you’re using a dedicated IP, you’ll have access to custom warming and monitoring. Either way, consistent volume and a healthy list directly influence this reputation.
Engagement Behavior Tracking
HubSpot tracks open and click rates in real time. If readers stop interacting with your emails, deliverability starts to drop—even if your message looks fine. Engagement-based segmentation tools let you identify and suppress unresponsive contacts before your metrics drag.
Feedback and Reporting Loops
Every send feeds into your analytics. From campaign performance reports to in-depth deliverability dashboards, you can trace what’s happening and why. HubSpot also updates contact fields like “Last Email Opened,” allowing better segmentation down the line.
Inputs:
- Authenticated sending domains, engaged contact lists, optimized email content, suppression filters, and consistent send rhythm
Outputs:
- Performance scores, bounce flags, open/click maps, and reputation trends
Together, these layers help you identify exactly what’s affecting inbox placement—and how to course-correct in time.
Main Uses Inside HubSpot
Managing Domain Authentication and Sender Authority
Effective deliverability starts with proving that HubSpot is allowed to send on your behalf. You handle this in the Domains section of your settings.
Example: Let’s say your team wants emails to come from marketing.yourdomain.com. You’d go to “Domains & URLs,” connect that domain, then update your DNS with the TXT and CNAME records HubSpot provides.
Once verified, every message you send from that address includes a DKIM signature—giving Google, Microsoft, and others the confidence to let it through.
Maintaining Clean and Compliant Contact Lists
Sending to disengaged or outdated lists drags your deliverability down fast. HubSpot gives you the tools to identify problematic contacts before they impact performance.
Example: You pull an active list that filters contacts by “Opened at least one email in the last 90 days.” The result: only active subscribers receive your next campaign.
You notice spam complaints and unsubscribes drop, and your average open rate improves with just one adjustment.
Monitoring and Improving Email Health
Your post-send metrics are where deeper issues reveal themselves. HubSpot’s Email Health dashboard tracks problem trends and flags warning signs.
Example: You notice a spike in bounces and dive into the detail panel. Turns out the issue is with soft bounces from expired or full mailboxes.
You remove the problematic contacts and dial back the send volume. Next send? Clean.
Common Setup Errors and Wrong Assumptions
Missing Domain Authentication
Why it matters: Skipping DKIM and SPF setup means your emails rely on HubSpot’s shared domains. This erodes sender trust.
Fix: Complete the verification steps under Settings > Domains & URLs.
Using Cold or Purchased Lists
Why it matters: These contacts haven’t opted in and often report your message as spam.
Fix: Build your lists from forms connected directly to HubSpot CRM so engagement is trackable, clean, and compliant.
Ignoring Bounce Thresholds
Why it matters: If your bounce rate spikes, HubSpot will restrict sending.
Fix: Check your Email Health dashboard often. Identify hard bounces, suppress them, and clean your list regularly.
Relying on Bloated or Untested Templates
Why it matters: Heavy styling, suspicious link patterns, or excess dynamic content all risk spam flagging.
Fix: A/B test with lightweight versions before scaling your final email to a larger list.
Step-by-step Setup or Use Guide
Before you dive in, make sure you have the right permissions—Super Admin or Marketing Access—and DNS login credentials for your domain.
Authenticate Your Domain:
- Go to Settings > Domains & URLs > Connect Domain.
- Choose “Email Sending Domain.”
- Copy HubSpot’s SPF and DKIM DNS entries and add them to your domain’s DNS. Verify once DNS changes take effect.
Align Subscription Types with Contact Consent:
- Check Marketing > Email > Settings > Subscription Types.
- Ensure each email category (e.g., newsletters, product updates) links to the right consent level in your forms and contact records.
Clean and Segment Your Contact List:
- Within Contacts, build filters to isolate bounces, opt-outs, or contacts who haven’t opened any emails in 90+ days.
- Use suppression lists to automatically exclude them from campaigns.
Run Test Drafts Through Spam and Preview Tools:
- Create your email under Marketing > Email.
- Use the “Email Health” preview to find risky formatting, image density, or flagged links.
Set a Smart Frequency Cap:
- Go to Email Settings and limit the number of emails a contact receives per day or per week. This prevents overload, especially if your campaigns overlap.
Do a Small-Scale Deliverability Test:
- Send to internal addresses hosted on Gmail, Outlook, and Yahoo.
- If your tests land in spam, adjust subject lines or template formatting before a full rollout.
Monitor Post-Send Performance Right Away:
- Use Analytics > Reports > Email Performance to track clicks and opens.
- Check Deliverability for bounces, complaints, and domain behavior.
Establish Workflows to Manage Engagement:
- Create automated flows to pause or prune contacts after a period without engagement.
- Trigger re-engagement emails for subscribers who unsubscribe before metrics turn.
Each step builds a feedback loop inside HubSpot: better setup, better performance, better data.
Measuring Results in HubSpot
To know whether your deliverability is improving, you need to watch the right data in the right places.
HubSpot surfaces these reports using “Reports > Analytics Tools > Email Performance” and from the “Email Health” panel in your Marketing Hub.
What to Check:
- Send Volume vs. Successful Sends — Are you landing in inboxes, or bouncing out?
- Bounce Breakdown — Watch for increases in hard bounces (bad addresses) and soft bounces (timeouts, full mailboxes).
- Spam Complaints — Even a small spike indicates targeting or messaging needs adjustment.
- Engagement Rates — Downward trends in opens or clicks could indicate that inbox providers are routing emails to the main tab.
- Unsubscribes — Signals that something in frequency, targeting, or content is misaligned.
- Domain Verification Status — Reconfirm your SPF/DKIM connections periodically inside Domains Settings.
Go further by building custom dashboards in HubSpot that connect these metrics to campaigns, contact segments, or timeframes.
That gives you insight beyond one-off sends—it reveals structural strengths or gaps in your email efforts.
Short Example That Ties It Together
Imagine you run a monthly product newsletter sent via HubSpot. Recently, you noticed open rates have dropped, and bounce rates are up.
You check your domain (marketing.example.com) and confirm it’s still verified. Then you clean your list, filtering for subscribers who’ve opened any newsletters in the past 120 days. You also activate a frequency cap to limit outreach.
Before your next full send, you test to internal addresses and confirm you’re back in inboxes.
The result: bounces drop back to normal levels, opens recover, and engagement stabilizes. And all of it is visible in your HubSpot dashboard—no outside tools needed.
How INSIDEA Helps
Many businesses struggle to implement and maintain the more minor—but critical—pieces of HubSpot’s email infrastructure, especially DNS updates, consent configurations, or detailed performance reporting.
INSIDEA helps marketing teams tackle these head-on with tailored HubSpot support:
- Onboarding: Set up key workflows, verified domains, and compliant subscription types from the start.
- Ongoing portal maintenance: Keep contacts clean and automations running smoothly.
- Workflow refinement: Build engagement-based logic to maintain deliverability.
- Report design: Create dashboards that surface risks before they affect results.
- Infrastructure audits: Review DNS, SPF/DKIM, and security settings for every domain.
- Team enablement: Get your sales and marketing teams fluent in real performance metrics.
Whether you’re scaling up campaigns or recovering from reputation hits, our team helps make your HubSpot setup resilient and performance-driven.
Inbox placement can make or break your email success—and it’s fixable. With the right setup and smart use of HubSpot tools, you can maintain clean lists, protect your sender score, and build engagement that lasts.
If you need help aligning deliverability with results, INSIDEA is ready to support you.
