R2Mail2

Name: R2Mail2
Rating: 3.5555556 (476 reviews)
Author: rundQuadrat OG

By: rundQuadrat OG App

E-Mail client supporting S/MIME, PGP Inline and PGP/MIME.

Overview

Google Play Store

Downloads

44,626 ▲ 3

Data as of 2026-08-03

Rating:

3.56

(476)

Version:

2.54.305

Last updated: 2021-09-07

Ranking

#309,177 ▼ 662

Overall

Features & Capabilities

R2Mail2 is an advanced email client for Android, offering robust cryptographic capabilities including Digital Signatures, Encryption, and Decryption using personal Soft-Token keys (.p12). With full support for S/MIME and PGP (Inline and MIME), it ensures your emails stay secure. The app supports IMAP, POP, SMTP, and Exchange servers, enabling push mail and unified inbox features.

Security is paramount: emails are stored in an encrypted database, private keys are protected by a master password, and certificate validation via OCSP and LDAP is supported. Users can import certificates from various formats and select appropriate encryption automatically per recipient. Regular updates maintain security, including mitigation against vulnerabilities like EFAIL. Visit r2mail2.com for more information.

User Growth & Download Statistics

App Communication Privacy & Security

By:

Downloads:

Rating:

Version:

2.54.305 Last updated: 2021-09-07

Creation date:

2012-04-19

Publisher country:

Email:

an*****@rundquadrat.at

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-08-03

Compare stats and ranking:

Ranking

# 309,177 ▼ 662

For Developers

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Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

rundQuadrat OG

Google Play Store

https://play.google.com/store/apps/details?id=at.rundquadrat.android.r2mail2

Email:

an*****@rundquadrat.at

Website:

http://r2mail2.com

User Reviews

R2Mail2 is praised for its strong encryption capabilities and support for multiple email protocols, appealing to users valuing security. However, it faces recurrent issues such as broken OAuth2 authentication on newer Android versions which hampers Gmail setup, unreliable email notifications, slow performance, and certificate validation problems. Users also find navigation less intuitive and report occasional crashes, suggesting the app may not have been actively maintained despite recent updates.

Pros

Strong support for email encryption including S/MIME and PGP.
Supports multiple email accounts via POP3 and IMAP protocols.
Provides robust security features like master password protection.
Minimalist and simple design with powerful functionality.
Reliable handling of sign/encrypt/decrypt operations.

Cons

OAuth2 authentication does not work properly, affecting setup for services like Gmail, especially on newer Android versions.
Notifications for new emails are inconsistent or missing.
The app experiences slow email fetching and occasional crashes.
User interface is sometimes confusing with limited navigation options.
Let's Encrypt certificates are not properly supported, causing validation issues.

Recent reviews

OAuth2 authentication does not work under Android 13. Yet another example of a half-assed email client under Android. It is a mystery to me why nobody seems to be willing the develop a solid email client under Android that supports S/MIME encryption and OAuth2 authentication.

Lu*****, 2023-12-29

I have found this to be an excellent email program since installing it back in 2014. No app is perfect and there are one or two niggles, but it covers smime encryption well, handles multiple email accounts in both POP and IMAP form. Well worth it. Edit: 24th Dec 2022: background process not staying running, might be suffering background process limitation of 32 max issue in Android 12 before getting killed. (Nokia G60)