With up to 2,000 subscribers and 12,000 emails per month, MailChimp can be used for free.

MailChimp packs a lot of functionality in a clean, usability-focused user interface.

MailChimp offers detailed tracking reports so you know how well your newsletter fared.

MailChimp offers an easy way to integrate with an impressive number of services.

MailChimp can be used by multiple people and offers control over who can edit and view what.

You can split your contacts into groups to send focused newsletters.

MailChimp provides videos and step by step instructions supplemented by images for common tasks, offers guidelines and insight into security and spam lawsuits, shares marketing reports, offers live chat support, etc.

MailChimp can automate sending out a newsletter that's populated by content from your RSS feed. Create a template and control how much of that content and how often is sent out.

Easy to use, detailed form customization options.

You can upload an unlimited amount of images each up to 10MB in size.

MailChimp allows delivering mail based on where the recipient resides.

Decide whether you want to test for best subject lines, from names, delivery dates and times, then choose the size of your test group and MailChimp will perform the test and send the winning result to the rest of your readers.

You can set up a campaign to send out e-mails based on time zones.

iOS and Android mobile applications are available.