An email address is not a lead yet.
Here is how it becomes one in under a minute.

1. 1
   Only an email

   A form fill, a download, a chat: often just one field.

2. 2
   The website

   Company name, what they do, where they are.

3. 3
   LinkedIn

   Team size and who decides.

4. 4
   Google Maps

   Phone number, rating and number of reviews.

5. 5
   Ready in the CRM

   A complete card, so the first message is personal.

The company and figures on the card are an example. Real builds use public sources and APIs you are allowed to use, and respect opt-outs.