Mailwarm - The email warm-up tool.
Thunder Mail - Cheap and simple transactional emails API with Amazon SES
Murlist Email Warmup - Improve sender reputation on autopilot
PopcornNotify - Send simple emails and text messages from one API
MailReach.co - The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.
PigeonBot - Send emails via Slack with the /email command