Opt-In Emails

Opt-in is the action to convince through email to receive email marketing messages, i.e. when your customer or client provides permission to receive information from you or your company.
There are several ways of how people provide their permission to you.

Here they are:
-Via subscription form on your website
-Via subscription form in your newsletters
-The permission may also be obtained during your company presentations where people can fill the submission from.

So, after such submission you have written proof that you can send them your emails, having along with it their registration and email addresses. The fact that email are opt-in is very important because you will definitely know that your emails won't be deleted as spam.