K-9 Mail

Full-featured email clientApache-2.0

Guerrilla Mail

Quickly receive anonymous and temporary mails.EUPL-1.2

mail

is a secure and open source e-mail clientApache-2.0

You Have Mail

Email Notification without Google Play ServicesAGPL-3.0-only

Tuta Mail

Encrypted email & calendar service - easy to use, secure by design.GPL-3.0-or-later

Slow Mail

Slow Mail is an Android email client for reading and composing emailsMIT

Voice Mail Player

Play media files through phone's ear-pieceGPL-3.0-only

Gridlink Mail

A fast, private JMAP and IMAP email client. No ads, no tracking, no Google.GPL-3.0-only

Aster Mail: Encrypted Email

Private email app with end-to-end encryption, aliases, and custom domainsAGPL-3.0-or-later

Sterna Mail

Private email client for JMAP and IMAP/SMTP. No Google services, no tracking.GPL-3.0-or-later

Infomaniak Mail

The secure messaging service for your emailsGPL-3.0-only

BlitzMail

Share content and notes via emailAGPL-3.0-or-later

SimpleEmail

Simple and minimalistic email appGPL-3.0-only

Inbox Pager

Read and write e-mailsGPL-3.0-only

FairEmail

Fully featured email client. Neat, intuitive user interface. Privacy friendlyGPL-3.0-only

Ltt.rs

Simple and maintainable Android e-mail clientApache-2.0

pcontacts

Sync Proton Mail contacts into the Android system address book.GPL-3.0-only

Meron

Mail app that sparks joyAGPL-3.0-only

Axichat

Replace your email, messenger, and calendar with one app.AGPL-3.0-or-later

Proton Pass: Password Manager

Password manager created by the scientists who met at CERN behind Proton Mail.GPL-3.0-or-later