Blog Engineering

Engineering

Building a safe multi-tenant email delivery pipeline with the MailChannels Email API

Email delivery is straightforward when one trusted application sends one predictable stream of transactional messages. It becomes a very different engineering problem when your customers, plugins, or AI agents can...

The 47-day certificate is coming: what hosting providers need to build now

Publicly trusted TLS certificates are on a fixed schedule from a maximum lifetime of 398 days down to 200 days, then 100 days, and finally 47 days in March 2029....

When Direct Connect goes dark: how our edge network rode out the July 24 AWS us-west-2 outage

On July 24, 2026, between 10:55 and 12:12 UTC (3:55 to 5:12 AM Pacific), AWS experienced a networking failure in its us-west-2 (Oregon) region that broke routing between the region...

Postmortem: The July 21 TLS Certificate Incident on api.mailchannels.net

July 21, 2026 On the morning of July 21, 2026, we rotated the TLS certificate on api.mailchannels.net, the endpoint that receives every message sent through our Email API. Within minutes,...

What Is Multi-Tenant Email Sending?

Multi-tenant email sending is the operation of sending email for multiple independent customers, users, workspaces, or software agents through a common platform. Because the platform does not fully control every...

How to Architect Email for a Multi-Tenant SaaS

A multi-tenant SaaS platform has a different email problem from an organization that sends only its own messages. The platform must govern customers, users, workflows, or agents whose behaviour it...

Cloudflare and Stripe Have an Abuse Problem. The Email Industry Should Be Paying Attention.

Last month, Cloudflare and Stripe announced something new. They built a way for AI agents to set up internet services on their own. An agent can now register a domain,...

How MailChannels' Dual-Layer Reputation Defeats the Account-Rotation Exploit

At MailChannels, we evolve our defenses constantly to stay ahead of email abuse. One of our most effective recent advances, the Dual-Layer Domain and Sender Reputation Policy, has quietly become...

MailChannels Is Now on Zapier

MailChannels now has a native integration in the Zapier app directory. Connect it to thousands of other apps and trigger transactional emails automatically, without writing any code. If you’re already...

Why Email Is the Most Dangerous Output Channel for AI Agents

There is a version of this post that chases a news cycle. This is not that version. Instead, this is for the developers and platform engineers who are building systems...

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