MailChannels

MailChannels delivers transactional email and filters outgoing mail for companies that send on behalf of many customers, such as web hosts, SaaS platforms and AI-agent firms. The Canadian company learned its trade in web hosting, and its service is built to stop one compromised or abusive sender from harming delivery for everyone else on a platform.

What MailChannels offers

• Email delivery — sending over SMTP relay or an API.
• Spam, virus and phishing filtering — catches bad outbound mail before it leaves a customer's network.
• Per-sender reputation — tracks behaviour for each individual sender, not just each account.
• Automated abuse response — webhook-triggered rate limits, suspensions or alerts when an account looks compromised.

Who it works with

MailChannels says a quarter of the hundred largest hosting providers use it, along with platforms built on them. It cites DreamHost, which reported email-delivery support tickets falling from about 300 a week to around 10.

Key facts

• Based in: Canada
• Volume: around 100 million messages a day, per its site
• Delivery options: SMTP relay and API