Personal Leads were made for Linkedin-only campaigns: everything about them came from Linkedin. To make them useful in campaigns with other channels, the system now looks for a person's email address when you open a draft in an email step. Not everyone has one that can be found, but those who do can now be in campaigns with email steps.
BlogLeads
Email addresses for Personal Leads
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for yourself.
The CRM is free for one person, and the rest of the suite is there when you need it.