Explore migration guides
Every migration is different, but the questions are often the same. What will change? What stays the same? How do you protect IP reputation, minimize risk, and transition without disrupting email delivery?
KumoMTA has helped MailOps teams migrate from a wide range of commercial and legacy email platforms. The guides below combine practical migration planning, platform-specific technical considerations, and lessons learned from real-world migrations to help you understand what to expect—and how organizations minimize risk while upgrading their email infrastructure.
Momentum
Replace Momentum without rebuilding your email platform
Read the Migration Guide ›
PowerMTA
Replace PowerMTA with infrastructure built for MailOps
Read the Migration Guide ›
SendGrid
Replace SendGrid with infrastructure built for high-performance MailOps
Read the Migration Guide ›
Why organizations migrate their email infrastructure
Organizations rarely replace an MTA because it stops delivering email. More often, migration is driven by changing business priorities, evolving infrastructure requirements, or the need for greater operational flexibility.
While every organization has different priorities, the most common migration drivers include:
Rising licensing costs
As email volumes grow, many organizations begin evaluating alternatives when licensing models based on throughput, server count, or proprietary feature tiers no longer scale predictably with their business.
Vendor acquisitions and roadmap uncertainty
Acquisitions, ownership changes, and shifting product strategies often prompt organizations to evaluate alternatives before future infrastructure decisions are made for them.
Containerized infrastructure and Kubernetes adoption
Organizations adopting containerized infrastructure increasingly look for email platforms that integrate naturally with Docker, Kubernetes, CI/CD pipelines, and automated deployment workflows.
Greater operational visibility
MailOps teams need detailed visibility into queues, delivery behavior, retries, and system performance to troubleshoot issues quickly and optimize delivery at scale.
Data sovereignty and compliance requirements
Organizations operating across jurisdictions or in regulated industries often require greater control over where email infrastructure, message data, and operational telemetry reside.
Reducing vendor lock-in
Organizations seeking greater long-term flexibility often prioritize open standards, transparent architectures, and deployment independence over proprietary platforms.
Building for long-term growth
For many organizations, migration is an opportunity to simplify operations, standardize infrastructure, and build an email platform that can support future growth with confidence.
What typically stays the
same
A carefully planned migration is designed to be as transparent as possible to your applications, users, and customers.
Your domains and sending identity
Your sending domains and DNS records typically remain unchanged, so recipients continue seeing email from the domains they already know and trust.
Your IP reputation
Existing IP addresses and sender reputation can often be preserved, avoiding unnecessary reputation rebuilding or warm-up periods.
Email authentication
SPF, DKIM, and DMARC policies typically remain in place, preserving your existing authentication strategy.
Existing applications and business workflows
Your applications, business workflows, and email generation processes usually continue operating with little or no modification.
SMTP integrations and APIs
Existing SMTP integrations and APIs typically remain unchanged but in some instances may require minor modifications/upgrades while the underlying email infrastructure is replaced.
Business logic
Routing policies, throttling rules, and delivery workflows can often be preserved with or adapted with minimal operational disruption.
What usually improves
While your applications continue operating much as they always have, the infrastructure supporting them often becomes significantly easier to manage.
Operational visibility
Gain visibility into queues, delivery behavior, retries, and system performance to simplify troubleshooting and capacity planning.
Automation
Integrate email infrastructure into automated engineering workflows using programmable policies, Infrastructure as Code, and CI/CD pipelines.
Scalability
Scale capacity and perform rolling upgrades more easily with containerized, cloud-native deployments.
Configuration management
Replace manually managed servers with version-controlled configurations that are easier to review, test, and reproduce.
Infrastructure flexibility
Deploy where it makes the most sense for your business, whether on-premises, in private cloud, or across public cloud providers.
Operational control
Control your own upgrade schedules, deployment architecture, monitoring, and policy management instead of relying on vendor-controlled upgrade schedules and product roadmaps.
Technical resources
Want to go deeper? Explore these engineering resources to better understand how KumoMTA works and what a migration looks like.
Ready to Explore KumoMTA?
Choose the migration guide for your current platform to explore migration considerations, technical differences, customer experiences, and what organizations typically gain after moving to KumoMTA. If you have questions about your environment, talk to one of our solutions engineers, they’re here to help.