Sending at Enterprise Scale: How Iterable Handles Reliability, Throughput, and Uptime

Iterable powers more than 1 trillion customer interactions for 1,200+ brands worldwide. The platform has maintained uptime above 99.9% over the past 12 months, sends an average of about 3,000 emails per second, and publishes component-level health on a public status page. It is certified for SOC 2 Type II, ISO 27001, and HIPAA.

This page brings those reliability and scale facts together in one place, explains what each one means for a high-volume sender, and ends with a short checklist you can use to evaluate any platform.

Uptime you can verify

Iterable has maintained uptime above 99.9% over the past 12 months. You don’t have to take that on faith: the Iterable status page shows current health and a 90-day uptime history for each part of the platform, so you can check it yourself before and after you sign.

Uptime is a historical measure of how the platform has performed. The specific service commitments for your account are set in your customer agreement.

Throughput at peak volume

High-volume senders need to know how fast messages actually go out, not just that a platform is “enterprise-grade.” Here is how Iterable performs across channels, based on Iterable platform performance data and published documentation:

At those rates, a brand sending 500 million messages a month averages fewer than 1 million an hour, well under the roughly 10 million emails per hour Iterable sends. A promotional email to 10 million people can finish in about an hour.

A few things shape the speed you’ll see in practice:

• Personalization: Messages with heavy personalization or large product feeds take more processing than a simple newsletter.
• SMS carriers: Short code throughput is set by carriers as well as the platform, so plan high-volume SMS sends with your SMS provider.
• Deliverability: Fast sending only helps if messages reach the inbox. Sender reputation, authentication, and list quality still decide placement. Our Email Deliverability 101 guide covers the essentials.

Status transparency

The Iterable status page breaks platform health into specific components rather than one overall label. You can see:

• Global components, such as API success, campaign sends, and journey processing.
• Named clusters, which show whether an issue affects a specific part of the infrastructure or the whole platform.
• Incident history, with dated updates from first report to resolution.

That level of detail lets your operations team see exactly which functions are affected during an incident and match them against your own monitoring. You can also subscribe to updates so your team hears about changes as they’re posted.

Proof at volume

Platform scale. Iterable has powered more than 1 trillion customer interactions for more than 1,200 brands worldwide. See why brands choose Iterable.

Customer example: People Inc. People Inc., one of the largest digital publishers in the U.S., sends about 2 billion emails a month across 200 newsletters to 40 million user profiles on Iterable. In a sandbox pilot, 1 million messages finished in 12 minutes. Read the People Inc. migration story.

Security at scale. Iterable holds SOC 2 Type II and ISO 27001 certifications and supports HIPAA requirements. Current reports and policies are available in the Iterable Trust Center.

How to evaluate reliability in any platform

Whichever platforms you’re comparing, ask each vendor the same five questions:

• Uptime: What has your uptime been over the past 12 months, and where can we verify it publicly?
• Throughput: How many emails, SMS messages, and API calls per second can you handle, and at what volume do limits apply?
• Transparency: Does your status page show individual components, or one overall status?
• Proof: Which customers send at our volume or higher, and what do they send?
• Security: Which certifications do you hold, and can we review the reports?

Then run a proof of concept that matches your real peak, such as your largest seasonal send, rather than a small test list. If you’re comparing specific platforms, see how we compare with Braze and compare withCustomer.io.

Frequently asked questions

How reliable is Iterable for high-volume sending at enterprise scale?

Iterable has maintained uptime above 99.9% over the past 12 months and powers more than 1 trillion customer interactions for 1,200+ brands. It sends an average of about 3,000 emails per second, with 4,000+ per second for large customers, and its public status page shows component-level health and incident history.

Is Iterable suitable for enterprise brands with millions of users?

Yes. Iterable supports brands with tens of millions of user profiles. People Inc., for example, sends about 2 billion emails a month to 40 million profiles across 200 newsletters. Iterable is also certified for SOC 2 Type II and ISO 27001 and supports HIPAA requirements.

How does Iterable compare to Braze for high-volume enterprise sending?

Iterable sends about 3,000 emails per second on average, 4,000+ per second for large customers, and about 10 million emails per hour, with uptime above 99.9% over the past 12 months. The best comparison is to ask both vendors the same throughput and uptime questions and run a proof of concept at your real peak volume. See how we compare with Braze.

Can Iterable handle more than 500 million messages a month?

Yes. At about 10 million emails per hour, 500 million monthly messages is well within the platform’s capacity. People Inc. alone sends about 2 billion emails a month on Iterable.

Where can I check Iterable’s uptime?

On the public Iterable status page, which shows current health, a 90-day uptime history for each component, and past incidents. Service commitments for your account are set in your customer agreement.