Short answer: HubSpot gives you two native ways to automate sequence enrollment:

-The Automation tab found in the sequences tool itself. (Available for HubSpot Sales/Service Hub Pro and Enterprise limited to Form submissions and Page Views) 

-The Workflow's "Enroll in a sequence" action (Available for Sales/Service Enterprise only)

The alternative for Sales and Service Hub Professional users is Enrollem, the only HubSpot certified app that allows you to automate enrollments via workflows using any object you like.

When to automate enrollments

Automating sequence enrollment is a huge time saver for your sales team. But with great power comes great responsibilty. Just because this functionality is now unlocked this isn't a call to replace your email marketing strategy with sequences. 

Sequences work perfectly when we want to send an email to a prospect, customer or anyone else that feels like it is a genuine one to one email written just for them. Think nurturing a sale, onboarding a new customer or checking in with a cold lead. 

Marketing emails are better suited when it's a clear wide blast where there's no illusion of this email being written specifically for the recipient.

"Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should." - Dr. Ian Malcolm, Jurassic Park

Sequence emails are sent from your gmail or outlook email account and so have to respect certain rules set by both this email provider and HubSpot which we will cover below. Some of these limits are set due to technical constraints, best practices and honestly, some are set to stop people using automated sequence enrollments as a means to spam people.

Understanding the limits of automated Sequence enrollment

No matter which method you use you are absolutely going to need to factor in some limits of sequences. If you're skeptical, all are confirmed directly in HubSpot's sending limits document:

• A contact can be enrolled in one sequence at a time. 
• Emails sent from Gmail and Outlook are capped at 1,000 emails per connected inbox per day. (This is emails total, not just sequence enrollments)
• Sales & Service Hub Professional users can enroll contacts in no more than 500 sequences per day
• Sales & Service Hub Enterprose users can enroll contacts in no more than 1,000 sequences per day

Alright now that the boring part is out of the way, let's get into automating your sequences!

Automating Sequence Enrollment Option 1: The Automate tab (Professional & Enterprise)

This is a feature most people miss because it's not in the Workflows tool at all. It's tucked inside the sequence editor itself, and per HubSpot's sequence editor documentation, it's available on both Professional and Enterprise.

Steps:

1. Open the sequence you want to automate.
2. Click the Automation tab at the top of the sequence editor.
3. Set a trigger: form submission or page view are the two native options.
4. Set the action: enroll from this sequence.
5. Save.

What it's good for: Simple limited automation like when someone fills out a demo request form, they go into your follow-up sequence automatically.

What it can't do: Anything beyond form submissions and page views. If you want to trigger off a deal stage change, a lifecycle stage update, or a custom property, this tab won't do it you need the Workflows actions covered next.

Automating Sequence Enrollment Option 2: Native Workflow Action (Enterprise Only)

This is where you can start to get more specific to your business needs, you're not limited to just form fills and page views but per HubSpot's own guidance, it's gated to Sales/Service Hub Enterprise. If you're on Professional, skip to option 3 below.

Steps:

1. Go to Automation > Workflows and create a new workflow
   
   
2. Set your enrollment trigger, this can be anything a normal workflow supports: property changes, list membership, deal stage, lifecycle stage, engagement events, whatever makes send for you.
   
   
3. Add an action, choose Enroll in a sequence.
   
   
   
   
   
4. Pick the sequence and choose the sender, it can be either a specific user or "contact owner."

Gotchas HubSpot's own guidance flags directly, worth repeating because people ignore them:

• Don't use this for freshly imported cold lists. It reads as spam behavior and tanks deliverability.
• Avoid vague enrollment criteria like "create date is today." Use criteria tied to actual behavior or lifecycle changes.
• Don't leave personalization tokens unset, an empty token sends as literal text (There shows up in the email), which looks worse than no personalization at all.
• If the underlying sequence gets deleted, the workflow silently stops enrolling contacts. 

Automating Sequence Enrollment Option 3: Enrollem

If you're not on HubSpot Enterprise but need to be able to automate your sequence enrollments based on your own custom criteria for example, when a lead is created, when a deal is closed won or any other fantasical ideas you might have then Enrollem is your best option. It's the only HubSpot certified app available in their marketplace for automating sequence enrollment with Sales or Service Hub Professional.

Steps:

1. Install Enrollem here for free 
   
   
2. Go to Automation > Workflows and create a new workflow
   
   
3. Choose your workflow type, it can be based on Contacts, Deals, Leads or any object you like, event Custom objects. Then set your enrollment trigger, again anything that can be used as a workflow trigger can be used to trigger sequence enrollment here
   
   
4. Add an action, and search for 'Sequence' or 'Enrollem' to find your Enrollem action. There will be two options, depending on whether you are using a contact based workflow or another object you will choose either the action 'Enroll contact in sequence' or 'Enroll associated contact in sequence' as seen below.
   
   
   
   
   
   
5. Choose your sequence and then the sender. Similar to the native action it can be either a specific user or "contact owner." 

With this tool you have now unlocked automated sequence enrollments from any object without paying the hefty HubSpot Enteprise price tag. It's worth noting that Enrollem's free plan will give you 50 automated enrollments each month but you can get up to 5,000 enrollments per month on paid plans.

Which HubSpot sequence automation method should you actually use?

If you're on Starter or don't have a Sales/Service seat with sequences permissions, none of this is available to you unfortunately. That's a plan limitation, not a configuration issue, and no workaround changes it.

FAQ

Can a contact be enrolled in two sequences at once? No. Enrollment is exclusive, one sequence per contact at a time. Enrolling them in a second sequence typically requires unenrolling from the first.

Do I need Sales Hub Enterprise to automate sequence enrollment? Not strictly. Enterprise unlocks the full Workflows "Enroll in a sequence" action with any workflow trigger. Professional gets a lighter version (form submission and page view triggers) via the sequence tool's own Automation tab, plus Enrollem is availablle if you want to set your own custom critiera.

What's the daily limit on automated enrollments? 1,000 enrollments per connected inbox, per day..

Will automated enrollment work on cold or newly imported lists? Technically yes, but HubSpot explicitly advises against it. It reads as spam behavior, hurts deliverability, and isn't what sequences are built for. Use it for warm, behavior-triggered contacts.