Contact form vs Mailing lists may not be the first question to be solved when creating and managing site. It is certainly one of the first issues of “how” you will communicate with your visitors.
In both cases we will seek electronic address (e-mail) from your visitors. In order not to confuse the third term that occurs with this topic is an Newsletter, which is nothing but a dedicated mailing list through which you will typically receive information about news on the site.

What is a Contact Form?Contact form vs Mailing lists
In the case where the selected Contact form as a way of communication to keep in mind that email addresses are not recorded in the database of your site. It can also indicate the pre-filling can encourage those who want to communicate to you that one time.
Below you can see the contact form which can be obtained by installing the WordPress plugin Contact form 7.
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More about how to protect the site by adding a CAPTCHA to form read here.
What is a Mailing List?
Contact form vs Mailing lists
The mailing lists (email lists, or just list) is a list of email addresses that visitors are left on your website in exchange for some services that you offer them. Visitors who have “entered” the mailing list called Subscribers or “subscribers” because they are on your website volunteer / subscribe for receiving certain services or information.
Forming an address book, you will be able to periodically send messages that are related to the content and theme of the site. That these messages are not marked as SPAM, the content of these messages must be in line with the theme for which these people entered.
E-mail addresses of site visitors are recorded in the database of your site.
Why is it important that the messages are not SPAM?
First, so that you would not report for spam, which can be legally punished. Second, because then people will not read your emails and sign you (Unsubscribe) from your mailing lists.
The recommended rate is 100 messages per hour (every 5 minutes for about 8 messages)
IMPORTANT: If you have a need for higher speed, ask your service provider.
Contact form vs Mailing lists
More on this topic can be read on the blog Dejan Burić.