The logical and necessary next step is to transition

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Google Drive Link: After they sign up (e.g., through a Google Form), you could redirect them to a Google Drive link where they can download the lead magnet. The form should also clearly state that they'll receive an email with the link.
Direct Email (Manual): If you're collecting emails on a physical sign-up sheet, you'd manually email each person the lead magnet link or attachment. This is highly unsustainable.
The Superior Way: Using an ESP for Delivery:
This is where a dedicated ESP shines. After a europe cell phone number list user opts-in through your ESP's form:

The lead magnet delivery is automated via a welcome email.
The email system tracks whether the email was opened and the link clicked.
It ensures a professional and immediate delivery experience.
Even if you're "starting small" by just jotting down emails, think about your lead magnet strategy from day one. It's the most powerful tool for convincing people to join your list and provides immediate value to your new subscribers.

Transitioning from Gmail's "Labels" to a Professional Email Service Provider (ESP)
As your "list" grows beyond a handful of personal contacts, attempting to manage it within Google Contacts and send mass emails from Gmail becomes unsustainable, unprofessional, and potentially problematic. to a dedicated Email Service Provider (ESP).

Why the Transition is Crucial:

Scalability: ESPs are designed to send thousands or millions of emails reliably.
Deliverability: They have sophisticated infrastructure to ensure your emails land in inboxes, not spam folders, by maintaining good sender reputation.