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HEY - Email at its best, new from Basecamp.
MailerSend - Better transactional emails for teams.
IsMyEmailWorking.com - Round trip email test application.
Unspam.email - Email spam checker and newsletter heatmap prediction.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.