Plunk

E-Warmup is an automated email warmup platform that improves email deliverability by building sender reputation through authentic engagement signals. It connects to Gmail, Outlook, SMTP, SendGrid, Amazon SES, Mailgun, and other major email providers to warm...

Front is a customer communication platform that brings email, chat, and social messages into shared inboxes. Teams collaborate on replies, assign conversations, and automate workflows to handle customer messages at scale. It was founded in 2013 and went...

Bento is a bootstrapped email marketing and automation platform combining campaigns, transactional email, segmentation, and visual workflow automation for SaaS companies and solopreneurs. It offers developer-friendly SDKs for Rails, Laravel, Node, and Python.

Missive is a collaborative shared inbox that combines team email, chat, and task assignment in one app. Teams use it to manage shared addresses and discuss messages internally before replying. The bootstrapped company launched in 2015 from Quebec, Canada.