I have been building CMS interfaces and developing plugins for some time. I have to admit, MailPoet Newsletters is a stellar plugin. Considering all the complications of email, database management, subscriptions, design, compatibility, etc. that a newsletter plugin encounters, this plugin is skillfully streamlined. Add the fact that it incorporates GMAIL, SMTP and PHP sending options, it is exceptional. While I found a number of quirks and overlooked bugs, I gave it 5 stars without question.