Switching ESPs With HubSpot: A Step-by-Step Guide
Switching email service providers is a big move, and using HubSpot as your new platform can make the process smoother and more strategic when you follow a clear plan.
This guide walks through how to prepare for a migration, move assets, warm up your new sending infrastructure, and use proven best practices to protect your deliverability during an ESP transition.
Why Move to HubSpot as Your ESP
Before you switch, it helps to clarify why you are moving to a new email platform and how HubSpot will support your long-term strategy.
- Unify email with CRM, forms, and automation.
- Gain better analytics and attribution.
- Streamline workflows across marketing channels.
- Improve personalization with contact data.
Having this vision documented will guide decisions about what to migrate and what to retire.
Assess Your Current ESP Before Migrating to HubSpot
An organized audit of your existing email platform is the foundation of a successful move to HubSpot.
Inventory Your Existing Email Assets
Start by listing everything that currently runs in your old ESP:
- Active mailing lists and segments
- Signup forms and lead capture flows
- Newsletters and recurring campaigns
- Automated workflows and drip sequences
- Templates, modules, and brand assets
Mark which assets are still used, which are outdated, and which can be consolidated once you are in HubSpot.
Review Performance and Deliverability
Look at recent performance data to understand your baseline:
- Open rates, click rates, and unsubscribe rates
- Spam complaints and hard/soft bounces
- Engagement by list or segment
This benchmark helps you monitor whether your performance improves after moving to HubSpot.
Plan Your Migration Strategy Into HubSpot
Once you know what you have, define how and when to move each component into HubSpot.
Set Clear Goals and Timeline
Outline your main goals for the migration:
- Reduce risk of deliverability issues
- Avoid duplicate sends during the transition
- Retire legacy content that no longer fits your strategy
Create a realistic timeline that includes discovery, implementation in HubSpot, testing, and a careful cutover period.
Decide What to Keep, Improve, or Retire
Not every legacy asset deserves a spot in your new HubSpot environment.
- Keep: High-performing newsletters, mission-critical automations.
- Improve: Templates that need design updates or new branding.
- Retire: Old campaigns, stale segments, and underused flows.
This pruning step keeps your new HubSpot instance lean and easier to manage.
Prepare Data and Contacts for HubSpot
Clean, permission-based contact data is essential for a successful switch to HubSpot.
Clean and Normalize Your Contact Data
Before importing anything, make sure your lists are accurate and compliant:
- Remove hard bounces and known invalid addresses.
- Suppress contacts with recent spam complaints.
- Deduplicate contacts across lists.
- Standardize key fields like country, state, and subscription status.
Proper data hygiene supports better segmentation and protection of your sender reputation in HubSpot.
Document Consent and Subscription Types
Map how consent and subscriptions work in your old ESP and how they will translate into HubSpot:
- Marketing vs. transactional emails
- Newsletter categories or interest groups
- Opt-in sources and timestamps
Aligning this structure before importing helps you respect subscriber preferences from day one.
Migrate Key Assets Into HubSpot
With a plan and clean data in place, you can begin building and importing into HubSpot.
Rebuild Templates and Branding
Use this opportunity to modernize your email templates inside HubSpot:
- Recreate core layouts using HubSpot design tools.
- Apply consistent branding, typography, and colors.
- Optimize for mobile responsiveness and accessibility.
Test a few core templates that will power most of your sends, such as newsletters, promotions, and product updates.
Recreate Automations and Workflows
Next, move your most important automation into HubSpot:
- Identify critical flows (welcome series, onboarding, nurture).
- Document triggers, delays, and branching logic.
- Rebuild them step-by-step using HubSpot workflows.
- Test with internal contacts before going live.
Keep legacy automations running in your old ESP until you have fully tested the new versions in HubSpot.
Import Contact Lists Into HubSpot
When your lists are cleaned and structured, import them into HubSpot in phases:
- Start with your most engaged segment.
- Verify field mappings and subscription types.
- Spot-check imported records for accuracy.
- Gradually add less-active segments over time.
This phased approach makes it easier to diagnose any data issues quickly.
Protect Deliverability When Switching to HubSpot
One of the most critical parts of moving to HubSpot for email is protecting and improving your deliverability.
Authenticate Your Sending Domain
Make sure your domain is properly authenticated for use with HubSpot and any other tools you rely on:
- Set up SPF records for approved sending sources.
- Configure DKIM signatures for your domain.
- Enable DMARC to protect against spoofing.
Work with your DNS host or technical team to apply these records before sending high-volume emails from HubSpot.
Warm Up Your IP and Sending Reputation
Whether you are using a shared or dedicated IP, you should warm up sending gradually:
- Begin with your most engaged contacts only.
- Send smaller campaigns with highly relevant content.
- Monitor opens, clicks, bounces, and complaints.
- Increase send volume week by week, based on results.
This warmup process demonstrates to inbox providers that your new HubSpot traffic is trustworthy.
Run Parallel Sending During the HubSpot Transition
Instead of a hard cutover, a short period of parallel sending can reduce risk when adopting HubSpot.
Define a Short Overlap Window
For a limited time, you may run select flows in both systems while you test performance:
- Keep mission-critical automations live in your old ESP.
- Launch cloned versions in HubSpot for internal testing.
- Shift live traffic to HubSpot only after thorough validation.
Set a clear end date to avoid confusion and duplicate sends.
Monitor Metrics Across Both Platforms
During this overlap period, stack your old ESP metrics next to HubSpot metrics:
- Compare open and click rates for similar audiences.
- Watch unsubscribe and complaint rates closely.
- Track any major changes in bounce patterns.
If you see issues, adjust volume, targeting, or content before extending your HubSpot sends.
Optimize and Improve After Moving to HubSpot
Once you are fully live, you can go beyond migration and start optimizing your program with HubSpot.
Refine Segmentation and Personalization
Use the CRM data and behavior tracking available in HubSpot to make your emails more relevant:
- Create segments based on lifecycle stage or deal status.
- Target by engagement level and recent activity.
- Insert dynamic content based on interests or products.
More precise segmentation usually leads to stronger performance and less list fatigue.
Test and Iterate on Email Performance
Set up a process of continuous improvement inside HubSpot:
- A/B test subject lines and preview text.
- Experiment with send times and frequency.
- Optimize calls-to-action and content layout.
- Review performance dashboards regularly.
Use these insights to refine both one-off campaigns and automated workflows over time.
Additional Resources for a Smooth HubSpot Migration
For deeper technical details and examples specific to switching email service providers, you can review the original guidance from HubSpot at this article on switching to a new ESP.
If you want expert help planning or implementing a migration to HubSpot, consult a specialized partner such as Consultevo, which supports complex CRM and marketing automation projects.
By auditing your current systems, planning a phased migration, and following deliverability best practices, you can move to HubSpot with minimal disruption and set your email program up for long-term success.
Need Help With Hubspot?
If you want expert help building, automating, or scaling your Hubspot , work with ConsultEvo, a team who has a decade of Hubspot experience.
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