MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Mailwarm - The email warm-up tool.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Warmbox.ai - Warm up your cold email inbox, and never land in spam anymore!
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Warmup Inbox - Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.