Email marketing is one of the most popular and effective ways to build a list and market to people. An opt-in list is essentially a list of emails that you can send your marketing materials to. Opt-in (Option In) means that you are asking people for permission to market to them by having them fill out that form; and Double Opt-In means that your subscribers have to confirm their subscription to your Newsletter to eliminate any SPAM concerns.
To build that list; you would need an Opt-In Form to post on your site: Your visitors see it, fill their information if they liked what they saw and you would have the beginning of a mailing list.
The following Plugins provide you with a simple way to insert an Opt-In Form in the sidebar of your WordPress blog as a widget and without changing a single line of code:
Constant Contact WordPress Widget
I use Constant Contact for my Newsletter at my other web sites, and this plugin allows me to change the look and feel of the Opt-in Form to fit nicely in my page template.
Author Description
This widget adds a Constant Contact signup form to your blog’s sidebar without touching code. Includes options for Title, Button Text, Tag Wrapper, Form ID Code, and Intro Paragraph, show or hide CC link, Safe Subscribe link, and template options.
Home PageiContact Widget
Author DescriptionAdd the iContact ‘Automatic Sign-up Form’ to your sidebar with this widget. Simply paste the code from the form you created in iContact into this widget. Your form will be converted into HTML
Home PageVerticalResponse Widget
Author DescriptionAdd a Vertical Response signup form to your sidebar without touching code.This widget includes many configuration options: Custom widget title, Define your own Button Text, Show an intro paragraph and define your own wrapping tag, Choose from two styles, Choose your own colors, Choose from three types of forms.
Home PageActiveCampaign Email Marketing plugin
Author DescriptionThe ActiveCampaign Email Marketing plugin connects WordPress with your email marketing software and allows you to choose a subscription form to embed (as a widget) anywhere on your site.
Home PageSendIt
Author DescriptionSendit enable you to send newsletters and collect subscribers from your blog. You can manage one or more list and using in post/pages or using the widget(customizable). You can extract content from post or pages or create your content to send to subscribers. You can also edit the template for each mailing lists just put some XHTML code on header and footer. Newsletter will be send in XHTML format.
Home PageGWA AutoResponder
Author DescriptionBuild your mailing list right from your WordPress Weblog. Subscribe and manage your entire list directly and automatically with WordPress. Build a list of unlimited size, Send daily email auto-responses, Easy to add, edit, and reschedule mailings,Send single messages to your list anytime, Import/Export entire list format.
Home PageWordPress Email Capture Plugin
Author DescriptionThis creates a 2 field form (Name & Email) for capturing emails. Email is double opt in, and allows you to forward opt in to services such as ebooks or software. When you are ready to begin your email marketing campaign, simply export the list into your chosen email marketing software or service.
Home PageAWeber Integration
Author DescriptionThis plugin provides a simple way to add one or more AWeber form(s) to your sidebar and optionally enable AWeber email web analytics for your website. It gives you access to a new “AWeber Mailing List” sidebar widget, that lets you enter the subscription form’s details. These details are used to automatically display your AWeber email subscription form.
Home PageWhile all of those plugins provide you with a way to post Opt-In Form on your sidebar, none of them will actually MAIL your Newsletter to your list or handle the Back-end management tasks, you still need to pay for EMail Marketing Service such as AWeber or Constant Contact to do that.
The only one that gives you Free Auto Responder Service is GWA AutoResponder, needless to say I recommend it and use it myself.

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