proton mail

Mulberry is a powerful, easy to use electronic mail (email) and calendar program

Unison Desktop can do everything that a legacy e-mail client does today.

Hamster is a local server for news and mail.

Free, fast and flexible mail client

a software for efficient management of periodic or bulk e-mail sending.

defNULLspam will guaranteed stop all spam mail.

Find air fares online and receive e-mail alerts on price-matched ones

YPOPs! is an application that provides POP3 and SMTP access to Yahoo! Mail.

Send out a single e-mail message to multiple addresses at one time.

CrunzhMail is a very small and simple e-mail client.