And if the incorrectly entered

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Ineptly leads to advertising pages
There are pop-ups that do not collect data, but show ads. And sometimes they have a deceptive "cross" - you click on it in the hope of closing it, but you end up on an advertising page. There is no need to explain why this is a real hell.
How to Make a Good Pop-Up
Show the form no sooner than one or two minutes after the user has entered the site. During this time, he will have time to look around the site;
We are for having a small number of subscribers at first, but collecting them whatsapp number list correctly, that is, using white hat methods and from relevant sources. After all, base loyalty is one of the keys to the success of your email strategy. Next, we will share with you working methods for collecting contacts in the offline and online spheres.To collect contacts offline, you will have to prepare yourself for painstaking manual work and be prepared for common problems:

the address is written in illegible handwriting;
missing letters;
the client confused the domain zone (.ru instead of .com) or the mail provider (mail instead of gmail);
the client left a non-existent or "abandoned" email.

The mailing service will send an incorrectly entered email to the inactive segment after several attempts to send a letter to it. As a result, instead of a live subscriber, you will receive another invalid contact. email turns out to be valid, but belongs to another person, you are almost guaranteed to be sent to spam. To avoid this, use double opt-in. Wait until the user confirms the subscription themselves, and only then send the mailing to their address.