The Problem
HubSpot allows admins to mark custom email properties as "required" via the email create form editor (Marketing > Email > Setup > Edit Form > Make Required). This is a great feature in concept. At GreenHouse Agency, we use it to enforce operational data hygiene across our clients' emails, things like campaign type, audience segment, or in this case a "Sent to Unengaged" classification property.
However, the enforcement is inconsistent and misleading. When a user attempts to publish or send an email without filling in a required property, HubSpot surfaces the message "Sent to Unengaged is required.", but then categorizes it under Warnings, not Required Fields, and still allows the send to proceed.
This means the word "required" appears in the warning text itself, but the system does not actually require it. Users can easily overlook that warning and publish or send anyway.
The Ask
Required custom email properties should behave like the existing hard-required fields (Recipients, Subject Line); they should block publishing and sending until resolved, not surface as ignoreable warnings.
Specifically:
Required properties marked in the form editor should appear under the "Required fields" section, not "Warnings," when the pre-send checklist runs.
The Send / Publish button should remain disabled until all required properties have a value, consistent with how Recipients and Subject Line already behave and how custom properties on the workflow create form behave.
Optionally, surface the create form to complete required properties after template selection but before redirecting to the editor.
Why It Matters
For teams using custom email properties for reporting, segmentation hygiene, or compliance tracking, a "soft" required field provides no real governance. The current behavior creates false confidence in the admin who configured the requirement, while giving senders an easy path to bypass it. If HubSpot exposes the concept of a required field in its UI and labels it as such in the warning copy, the system should enforce it accordingly.
This is especially important for Marketing Hub customers at scale: agencies, enterprise teams, and regulated industries (like financial services) where email metadata accuracy is tied to reporting integrity or audit requirements.
Workaround (and why it's insufficient)
Currently, there's no reliable workaround. Admins can document the requirement in SOPs, but there's no way to programmatically enforce it at the platform level.
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