Helo

Helo is an email delivery platform for developers and businesses that need to send email from their applications. It provides an email API and SMTP sending, with support for transactional messages such as password resets and promotional email. Separate sending streams help keep different types of email isolated, while multi-tenant capabilities support platforms that send email on behalf of their customers. Helo also provides tools to isolate customer sending, identify spam activity, and let customers send using their own domains. ([helohq.com](https://www.helohq.com/))

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