MailClark - The Slack bot for external communications
MailerSend - Better transactional emails for teams.
Alert.email - Get your important emails delivered to a Slack channel
HEY - Email at its best, new from Basecamp.
OneBar - AI-powered Q&A knowledge base for Slack teams
MailChimp - MailChimp is the best way to design, send, and share email newsletters.