Mailroom is described as 'provides seamless integration between Gmails world class mobile web app and familiar iPhone conventions, along with progressive web interface enhancements for features Google left out, giving you access to your local iPhone Address Book, attachment viewing, managed'. There are more than 10 alternatives to Mailroom for a variety of platforms, including Android, Android Tablet, iPhone, Online / Web-based and Mac. The best alternative is K-9 Mail, which is both free and Open Source. Other great apps like Mailroom are Outlook.com (Freemium), FairEmail (Freemium, Open Source), Spark (Freemium) and Spike (Freemium).
K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.
FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.
Bring your workspace together into one unified app. It’s everything your team has been looking for in a productivity and messaging app, but easier, and all with your email. Welcome to the shortest path to done.
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
Librem Mail – end-to-end encrypted email used by nearly everybody already * Email client with support for IMAP and POP3 * Encrypt and sign your emails with OpenKeychain * Multiple accounts * Free and open-source software