Any company that provides a service.

A message sent automatically to new list members as soon as their email addresses are added successfully, usually via a web opt in form hosted on a website. It contains a greeting welcoming the new member to the mailing list and sometimes may even contain special promotion offers or ebook download links.

Advance-authorized list of email addresses, held by an ISP, subscriber or other email service provider, which allows email messages to be delivered regardless of spam filters.

A prospect who is engaged actively in the buying decision for a product or service.

In email marketing this term refers to the page a user lands on after clicking on a link in an email. Generally it is a form, survery, offer or full article version of content in the email. This can sometimes be the homepage of a website but the majority of the time it is a page that is tailor made for a specific campaign.