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MailHog is an email testing tool inspired by MailCatcher, but easier to install.
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Single Notification API for Every Channel (SMS, Slack, Whatsapp, Email, SMS, Push, App Inbox).
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EmailEngine is an email client but for apps, not people. It connects to the user's email server, translates REST API requests from the app to IMAP and SMTP commands, and sends webhooks for changes like new or deleted emails.