Changelog · back to all

Momentum 5.2 release

February 17, 2026feature

Momentum 5.2 is now available for download via the MessageSystems customer portal. This release delivers platform upgrades, enhanced security, and improved observability across your email infrastructure.

New features

RHEL 10 Support (Intel x86_64 & ARM aarch64) – Deploy on Red Hat Enterprise Linux 10 across both Intel and ARM platforms for broader OS compatibility
TLS v1.3 for SMTP – Strengthened encryption and faster handshake performance for SMTP connections using GnuTLS
New DNS Configuration Options – Finer control over DNS behavior with configurable UDP buffer sizes and dynamic source port reuse limits

Improvements

Enhanced Observability – New message fields for better delivery diagnostics, smarter log throttling, and streamlined metrics management
Platform & Dependency Updates – Updated bundled components and streamlined packaging for improved performance, security, and easier maintenance

Fixes

Several bug fixes for improved stability.

Start with one channel.
Add the others when you're ready.

A test API key is yours immediately. Production unlocks when you add a payment method and verify a sender.

Get started Read docs

Using Claude Code, Cursor, or Codex? Copy a setup prompt and your agent installs the Bird CLI and skills for you. Pick yours:

                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                    @@@@.                                                                       
                                                                                  +@@@@@@;                                                                      
                                                                                .@;..:  ;                                                                       
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                           ..@;                                                 
                                                                                                          @@@+                                                  
                                                                                                         +@@@:                                                  
                                                                                                       .@@@+ .                                                  
                                                                                                      ;*                                                        
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
                                                                          U@                                                                 @                  
                                                                       .+;@@                                                                U                   
                                        U.                             @@@@@@@                                                                                  
                                        @@@.                           @@@@@U@                                                                                  
                                        @@@*U.                         :*@@: *                               :.                                                 
                                          @@:                            @;                               U@@U                                                  
                                          ;                             :@                              .@@@@.                                                  
                                                                        *@                             +@+@@@@                                                  
                                                                                                      @;  +U                                                    
                                                                                                                .                                               
                                                                                        +    U                .*@                                               
                                                                                         +:  *               .@@@@U                  +                          
                                                                                           @@*                U@@@@               U;.@.:;                       
                                                                                            @@@               :@@ U               U@@@@@+                       
                                                                                             *@@              ;@:                   U@@@:                       
                                                +:                                           *@U:            ;@@@                  U@@@;                        
            U*:              .U@U            *@@@@;                                                          .@@U                +@.                            
             *@@U         :@@@@@;           :@@@@@+                                                                             ;*:                             
             @@@@:    @@@; :@UU.           .@@U@@:U