Apps like Briar Mailbox

Here are some great alternatives to Briar Mailbox by Briar Project :
Chiffry Secure Messenger
Chiffry Secure Messenger
★4.5
Email Go: All email app
Email Go: All email app
★4.4
mail.co.uk Mail
mail.co.uk Mail
★4.3
Free Mailer - Mail Client
Free Mailer - Mail Client
★3.6
Mail.ru - Email App
Mail.ru - Email App
★4.6
Yandex Mail
Yandex Mail
★4.4
Vigenere Cipher
Vigenere Cipher
★3.4
Messages
Messages
★4.1
Criptoo
Criptoo
★3.5
TransMessenger
TransMessenger
★4.2
Voxer Walkie Talkie Messenger
Voxer Walkie Talkie Messenger
★3.5
Conversations (Jabber / XMPP)
Conversations (Jabber / XMPP)
★4.3
Spixi IM & Wallet
Spixi IM & Wallet
★4.7
Chapp - Private Messenger
Chapp - Private Messenger
★3.5
Pryvate Messenger
Pryvate Messenger
★3.7
GHOST Messenger
GHOST Messenger
★3.3