Learn How I Built Email List of 7k Subscribers in a Day!

Please follow the steps to create your email list quickly. In as much as you run a valid LinkedIn profile and you are familiar with your connections. You could build an email list from the database of your connections instead of the regular LinkedIn In mail that has been grossly abused.
Here are some vital email tips to ensure you get the best result from email out reach to you an email list like this:
Define choose an objective for each email outreach, avoid too many call-to-actions
Engage your reader from the beginning
Personalize your address and email copy
Measure each email campaign and iterate in subsequent campaigns.
And here are email tips from Hubspot I have found useful over time:
Segment email contacts list and clean regularly
message must tally be relevant to readers’ stage in the buyer’s journey
Optimize email copy and creative for mobile, most people from mobile devices
Constantly update contact list: 25% of email database decays annually.

Infographic Source: https://contentkrush.com/blog/email-marketing-subscriber-list/