ProtonMail

parent coCERN

regionGeneva, Switzerland

proton.me

MIcrosoft 365 (Office 365)

parent coMicrosoft

microsoft.com

Shift for Gmail

tryshift.com

Mailbird

getmailbird.com

Xobni defunct

regionSan Franciso, California

Thunderbird

thunderbird.net

Texts

texts.com

SurveyMonkey

surveymonkey.com

Superhuman

superhuman.com

SnappyMail

snappymail.eu

SendSafely

sendsafely.com

Sendmail

proofpoint.com

Nylas

nylas.com

Apache James

parent coApache Software

james.apache.org

K-9 Mail

ISIPP SuretyMail

isipp.com

Hushmail

hushmail.com

HEY

regionDenmark

hey.com

Haraka

haraka.github.io

Edison Mail

edison.tech

Dispatch

dispatchapp.net

ContactMonkey

regionToronto, Ontario

Blue Mail

Baemail

baemail.me

Aqua Mail

aqua-mail.com