Apps like K-9 Mail

Here are some great alternatives to K-9 Mail by Mozilla Thunderbird :
R2Mail2
R2Mail2
★3.9
OpenKeychain: Easy PGP
OpenKeychain: Easy PGP
★4.1
eM Client - Secure Email App
eM Client - Secure Email App
★3.2
mail.ch Mail
mail.ch Mail
★3.6
mail.co.uk Mail
mail.co.uk Mail
★4.3
myMail: for Outlook & Yahoo
myMail: for Outlook & Yahoo
★3.6
FlowCrypt Encrypted Email
FlowCrypt Encrypted Email
★4.1
BirdBox
BirdBox
★4.7
Proton Mail: Encrypted Email
Proton Mail: Encrypted Email
★4.4
TypeApp mail - email app
TypeApp mail - email app
★4.3
Mailfence secure private email
Mailfence secure private email
★4.0
MailDroid - Email App
MailDroid - Email App
★3.7
mail.com: Mail app & Cloud
mail.com: Mail app & Cloud
★4.5
Email Blue Mail - Calendar
Email Blue Mail - Calendar
★4.4
Free Mailer - Mail Client
Free Mailer - Mail Client
★3.6
Samsung Email
Samsung Email
★4.4