Short answer
HubSpot's KB: the recommended path is the default blog subscription field. With workflows, you can use a custom checkbox instead.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Test by subscribing yourself.
The default field is recommended.
HubSpot's KB: the recommended path is the default blog subscription field. With workflows, you can use a custom checkbox instead.
The relevant screen in my demo portal.

Test by subscribing yourself.
One email when a new article publishes.
If this did not fix it, the problem is probably specific to your setup. Book a call and we will look at it together.
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