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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...

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

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....

The 47-day certificate is coming
Industry

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...

Post Mortem

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,...

Corporate

Inside MailChannels: A Day in the Life of the Spam Fighters

Email should just work. And when it does, most people don’t think about the machinery behind it. But for web hosting providers, that simple “send” button is anything but simple....

A Day In The Life Of Our Ops Team 2
Corporate

Important Update: MailChannels' Email Sending API for Cloudflare Workers to be Terminated

At MailChannels, our mission is to empower safer connections in an open world. We have been committed to supporting internet email as a truly open protocol since 2012. In early...

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Corporate

Join MailChannels at CloudFest 2022

Join MailChannels at Cloudfest 2022 with our free registration link.

Engineering

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...

Dual-Layer Reputation
Engineering

Does MailChannels Use Machine Learning, Content-Based Scanning, or Behavior-Based Rules?

Email security and deliverability are critical concerns for web hosts, businesses, and email service providers. With increasing spam and phishing attacks, email providers need advanced filtering solutions that go beyond...

Does MailChannels Use Machine Learning, Content Based Scanning, Or Behavior Based Rules
Engineering

How Sender Policy Framework (SPF) improves your email deliverability

Domain owners publish SPF information in the Domain Name System (DNS) - a globe-spanning database of internet information - in something called an SPF record. Boiled down, an SPF record specifies in computer-readable form a set of rules that email receivers can use to verify that an email sent from your domain originated from a server that is authorized to send on behalf of your domain.

Industry

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....

The 47-day certificate is coming
Industry

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...

Industry

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...

Single Sender Vs Multi Tenant
Podcast

Ethical hosting is more profitable than cheap hosting

For years, hosting providers have been treated like utilities. Power on. Bits flow. Problems belong to someone else. That model is breaking down. In a recent MailChannels podcast conversation, infrastructure...

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Podcast

Cleaning up the internet, upstream: what web hosts can learn from Monarx’ CTO

In enterprise security, a false positive is annoying. A user calls support and asks why a file was quarantined. Someone investigates, restores it, and the business moves on. In hosting...

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Podcast

Why Domain Reputation is the New IP Reputation | Matt Vernhout

In this episode, email deliverability expert Matt Vernhout joins the podcast to discuss essential insights into the current state of email delivery. Matt emphasizes the importance of looking at campaign...

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Post Mortem

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,...

Post Mortem

MailChannels Service Disruption: All The Gory Details

On April 22, 2024, at 05:30 UTC, our monitoring systems alerted us that SMTP connection times had spiked from the normal sub-1 second to over 7 seconds. This was the...

MailChannels Service Disruption
Product

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...

MailChannels Is Now on Zapier
Product

MailChannels Enhances Email Security with DNSSEC Implementation

MailChannels is excited to announce that we have implemented DNSSEC (Domain Name System Security Extensions) on the primary domain associated with our email delivery service, mailchannels.net. This milestone is a...

DNSSEC Implementation
Product

Bolstering Your Email Security: Introducing Domain Lockdown™

Domain Lockdown empowers you to prevent unauthorized MailChannels users and accounts from sending emails from your domain.

Recent Updates

Industry

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...

Single Sender Vs Multi Tenant
Industry

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...

Multi Tenant SaaS Email Architecture
Industry

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,...

Cloudflare Stripe Abuse OG
Corporate

Customer Success Story - Rebel.com

Rebel.com Cuts Support Tickets Related to Email Delivery by 90% with MailChannels

Corporate

The Year in Review: MailChannels Features and Product Highlights from 2020

Looking back, here are some of the platform improvements that were made during this extraordinary year.

Corporate

Web Hosting Events 2021

Upcoming web hosting events in 2021

Engineering

Upcoming change from Spamhaus will make March 1st a difficult day for some

On February 11th, Spamhaus reminded its users that they would start to block queries sent from public Domain Name System (DNS) resolvers beginning on March 1st

Engineering

How To Save Money Without Sacrificing On Reliability When Using AWS Spot Instances

One of the best tools in our cost-saving arsenal is a technology offered by AWS called Spot Instances.

Engineering

Palinurus – A Helm chart conversion tool

Palinurus converts Kubernetes resource files to helm charts automatically, eliminating a manual, error-prone step on the road from service definition to reliable deployment.

Industry

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...

Multi Tenant SaaS Email Architecture
Industry

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,...

Cloudflare Stripe Abuse OG
Industry

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...

Mailchannels Blog Hero Reputation Curve
Podcast

The SparkPost Story: George Schlossnagle

In this episode, we welcome George Schlossnagle, a mathematician turned tech entrepreneur, who shares his fascinating journey from academia to co-founding one of the world’s leading email infrastructure platforms.  George...

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Podcast

From Yahoo to LinkedIn: The Evolution of Email Deliverability

In this episode, we talk with email deliverability expert, Udeme. Udeme, who has worked with major players like Yahoo and LinkedIn, shares his experience in the email industry, offering valuable...

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Podcast

Pioneering the Future of Web Hosting with Konrad Keck

Join us as we delve into the inspiring journey of Konrad Keck, founder of Modules Garden, and his entrepreneurial path in the web hosting industry. In this episode, we explore...

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Product

Announcing Log Search API

We've developed a new API that allows you to easily search through your email logs and find exactly what you're looking for.

Product

Announcing the Monthly Usage Report

With the new Monthly Usage Report, it’s easy to access your important MailChannels insights.

Product

MailChannels Enables Free Email Sending for Cloudflare Workers Customers

Today, MailChannels is launching a free email sending service for Cloudflare Workers. The new service enables Cloudflare developers to send email messages from within their Workers apps, with no authentication or domain verification required.

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