Evaluate Momentum.
Bring message processing and routing requirements to a release-specific architecture review. Include configuration, monitoring, rollback and the team responsible for the deployment.
Plan the operating model ↗EmailMomentum
Momentum.
Shape the sending pipeline.
Bring your processing and routing policy into the email operation. Configure the supported pipeline around the traffic and responsibilities your team owns.
A policy with somewhere to go.
See how delivery policy routes an example message and responds to receiver feedback. Keep application intent connected to the infrastructure that sends it.
- 01 / PROCESSClassify the traffic
transactional - 02 / ROUTESelect a binding
suspend_delivery: false - 03 / OBSERVERead the receiver result
Not run
CONCEPTUAL BINDING MAP
{
"binding": "transactional",
"source_ip": "192.0.2.10",
"suspend_delivery": false
}Your application assigns traffic. Your team owns configuration, deployment, queue policy, monitoring and recovery. Confirm syntax and behavior for the supported Momentum release before use.
Read the Momentum 4 binding reference ↗The next operating step.
Not traced. Run the current policy and response selection to inspect the example.
Outbound is suspended in this review binding. No provider response occurs. Inspect the held queue and authorize release under your supported operating procedure.
451 temporary deferral: retain queued work, inspect the receiver response and configured retry/rate policy, then recover under your operating procedure. This message is not delivered.
250 receiver acceptance: the server accepted the example message. Inbox placement and the customer's action remain unknown.
Companies that trust Bird across their communications.
Read Bird customer storiesChoose the control your program needs.
Compare the sending responsibility.
PowerMTA and hosted Email are distinct operating choices. Evaluate delivery control alongside the infrastructure your team can maintain rather than treating the products as interchangeable.
Compare PowerMTA ↗Powerful email infrastructure
Whatever your tech stack looks like, and no matter what your sending requirements are, Momentum can be tailored to fit your business.
International support
Bird's the first commercial MTA to provide SMTPUTF8 support, allowing emails with Unicode characters in mail header fields. Reach audiences worldwide with comprehensive language support.
Control your sending workflow
The brain of the platform lets you develop customized workflow rules. Support your unique business processes with flexible policies. Create tailored sending strategies.
Enterprise-grade protection
TLS encrypts email during transport. Confirm the supported authentication and security configuration for your deployment.
Lightning-fast delivery
Send messages at lightning speed and extraordinarily high volumes, according to your precise instructions, ensuring reliable email delivery at scale.
Outbound controls
Control the way messages are sent: mail is segregated according to your rules, with individual delivery parameters that adjust dynamically based on deliverability results.
Real-time monitoring
Use the Intelligence Router’s reporting and routing controls to investigate delivery signals and adjust supported delivery policies.
Adaptive Delivery keeps your mail moving.
Every mailbox provider pushes back differently, throttling, deferring, or rejecting mail when you send too fast or your reputation slips. Momentum reads those signals as they happen and adjusts on its own: slowing connections to a provider that's straining, holding messages to retry later, or pausing a stream until an issue clears, then resuming. You reach the inbox by respecting each provider's limits instead of hammering them, and your team can see exactly what was throttled and why. It's the same deliverability discipline behind the hosted Bird Email API, running on infrastructure you operate.
Run it wherever you need to.
Momentum runs on your own hardware, on any major cloud, or split across both. Keep message generation in your data center for control or compliance and burst to the cloud for peak load, or move the whole operation to the cloud and back as your needs change. Scope configuration, licensing and migration for the deployment you choose.
Put it into practice.
Continue with the documentation, guides and examples for this topic. Resources are in English.
Questions about Momentum MTA
What is Momentum MTA?
Momentum is our on-premises email infrastructure platform for high-volume sending, with customizable workflows, routing, and delivery parameters set through its Policy Manager. It is built to scale with your sending volume while keeping performance stable, and it supports full Unicode (SMTPUTF8) so you can send to international character sets.
What is Adaptive Delivery, and how do I monitor it?
Adaptive Delivery is Momentum's automatic traffic shaping. It watches how each mailbox provider responds to your mail and adjusts in real time: throttling, deferring, or briefly pausing a stream to protect your reputation, then ramping back up once things clear. You reach the inbox without manually babysitting send rates for every provider. The Intelligence Router shows you this happening across all your data sources, with real-time alerts whenever it makes an adjustment.
Can I run Momentum in the cloud, and is it still being developed?
Yes to both. Momentum runs on your own servers, on any major cloud, or split across the two, so you can match it to your infrastructure, cost, and compliance needs and change that mix over time. It also keeps shipping: recent releases keep it current with modern operating systems, TLS 1.3, and up-to-date security and SMTP standards, and expose message events through real-time APIs you can feed into your own reporting and automation.
Connect delivery policy to your email operation
Enterprise email
Compare managed sending with infrastructure your own team operates.
PowerMTA
Separate sending streams with virtual MTAs, IPs and queues.
Inbox Insights
Investigate placement alongside your own delivery reporting.
Bird Email platform
Explore sending, campaigns, receiving and delivery controls.
Talk to our email team
Talk through your Momentum deployment.
Discuss message policy, infrastructure, licensing and the team operating your deployment. We’ll help you evaluate Momentum against those requirements.
Send your requirements. Our team will follow up by email about deployment and support.