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Oct 3, 2026NewsletterRSS

About Outbox News

Outbox News is an independent newsroom covering email APIs: the services developers use to send, receive, sync and test email, and the mailbox rules that decide whether it lands.

We are not affiliated with any of the companies we cover. Every claim is sourced to a dated, public record, and corrections are noted on the article.

What we cover

  • Sending APIs: Resend, Postmark, SendGrid, Mailgun, Amazon SES, MailerSend, Mailfully and more
  • Inboxes and mailbox APIs: AgentMail, Nylas, Unipile, the Gmail API and Microsoft Graph
  • Deliverability, testing and notifications: Gmail and Yahoo sender rules, DMARC, Mailosaur, Knock, Novu and more