Koalify – Email Validation: Custom properties in HubSpot

When you install Koalify – Email Validation, it automatically creates four custom properties on your HubSpot contacts. These properties are how Koalify stores and surfaces email validation results directly inside HubSpot.

You can use these properties to build views, lists, reports, and even notifications that help you act on email quality across your contact database.

Koalify - Email Validation Properties

Property name	Property description	Property type
Koalify - Email Validation Status	The overall validation result for this contact's email address	Dropdown/radio select
Koalify - Email Validation Details	A more granular breakdown of why the email received that status	Dropdown/radio select
Koalify - Last Email Validation Date	The date this contact's email address was last validated	Date
Koalify - Email Validation Suggestion	A suggested corrected email address.	Single-line text

Koalify - Email Validation Status

The Status property stores the overall verdict. There are exactly three possible values.

Status	Meaning	Safe to send?
Valid	The mailbox exists and can receive mail.	Yes
Invalid	The address is dead — bad syntax, no mail server, or the mailbox doesn't exist.	No
Unknown	No definitive answer — the mail server stalled the check. Retried automatically in the background.	Not yet

Status is the property to filter and act on. Use it to segment contacts, suppress invalid addresses from campaigns, or trigger workflows.

Koalify - Email Validation Details

The Details property adds the reason behind the status. You will always see exactly one Details value: the most important one, chosen by priority.

Details	Typical status	What it means
Retrying	Unknown	A retry is in progress. The label hides the per-attempt reason until a final answer lands.
Catch-all	Valid	The domain accepts mail for any address, so this specific mailbox cannot be confirmed.
Disposable	Invalid	A throwaway or temporary email provider.
Greylisted	Unknown	The server temporarily deferred the check (anti-spam stalling). Still being retried.
Free domain	Valid	A consumer provider such as Gmail or Outlook.
Role-based	Valid	A shared inbox such as info@ or support@, rather than a named person.
OK	Valid	Confirmed deliverable, no special attributes.
Domain invalid	Invalid	The domain has no usable mail server — DNS or MX failure, or a bad domain.
Mailbox invalid	Invalid	The mailbox doesn't exist or the syntax is incorrect.
Mailbox full	Invalid	The mailbox exists but cannot accept more mail.
Unknown	Unknown	No category could be determined.

Details refines your decision. A Valid result with a Catch-all or Role-based detail is technically sendable but worth a second look before adding to a high-volume campaign.

Koalify - Last Email Validation Date

Stores the date the contact's email address was last validated. Use this property to identify contacts who haven't been checked recently — for example, to build a list of contacts where the last validation date is more than 30 days ago.

Koalify - Email Validation Suggestion

When Koalify detects a likely typo in an email address (for example, name@gmial.com), it stores a suggested correction here. Review and apply suggestions manually before updating the contact's email address.

What you can build with these properties

Active list of all contacts with a Status of Invalid: to suppress from campaigns or flag for cleanup
View filtered by Details = Catch-all or Role-base: to review before a high-value send
Workflow that enrols contacts when Status = Invalid and notifies the record owner
Report showing the breakdown of Valid, Invalid, and Unknown across your contact database
List of contacts where Last Email Validation Date is more than 30 days ago: to schedule a re-validation pass via a HubSpot workflow.