MailOptin

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OptinMonster is a powerful lead generation software for websites that want to increase leads to email lists and marketing campaigns. The software is available as a WordPress plugin but is also provided as a SaaS that can be used by any type of website. OptinMonster is used by over 1 million marketing agencies, bloggers, eCommerce websites, and small business websites world-wide.

WP Subscribe Pro is a subscription WordPress plugin that you can setup and connect it with your subscription service. These days, email marketing is vital, and having an email subscriber list is key to running a successful blog. With WP Subscribe Pro you can boost your conversions of traffic to subscribers, and generate more residual traffic. WP Subscribe Pro integrates with popular third-party software and email marketing solutions like Feedburner, MailChimp and Aweber and more.

Tutanota is the world's most secure email service, easy to use and private by design. Tutanota brings secure email for everybody.

K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email. K-9 Mail is designed for both novice and power users and offers lots of features for everyone. It provides features like Push IMAP Support, GPG & PGP/MIME support, Per Account Notifications, Unified Inbox, White and Dark Theme, and Signatures.

Microsoft Outlook is a freemium personal email service and email client created by Microsoft. Microsoft Outlook does not scan your email for the purpose of serving you ads. The Microsoft Outlook email client allow you to be productive and stay connected from your home, on the go, and everywhere in between. Microsoft Outlook also integrates well with other Microsoft service allowing you to reach an eco-system of productive apps from within your mail client, be it in the browser or natively on your computer or mobile device.