SparkPost · kkelley1 · Jun 9, 2025 · Jun 9, 2025 · juliebin · Jun 9, 2025
diff --git a/content/momentum/4/modules/auth-radius.md b/content/momentum/4/modules/auth-radius.md
@@ -16,15 +16,15 @@ The following example demonstrates how to configure Momentum to pass LOGIN crede
 ```
 # Configure the RADIUS client
 auth_radius {
-  NAS-IP-Address = 10.0.0.1 # the IP address of this SMTP server
+  NAS-IP-Address = fd01:345::1 # the IP address of this SMTP server
   server "one" {
     host = "radius-1.example.com"
     secret = "secret1"
     max_tries = "1"
     timeout = "30"
   }
-  server "two" {
-    host = "radius-2.example.com"
+  server "ipv6wport" {
+    host = "[2001:fd3::1]:2812"
     secret = "secret2"
     max_tries = "2"
     timeout = "30"
@@ -85,7 +85,7 @@ RADIUS servers can be defined using the dictionary syntax shown above; the dicti
 
 <dd>
 
-The hostname or IP address of the RADIUS server. If a colon is present in the string then the left side of the string will be used as the hostname/IP address and the right hand side will be used as the port number on the server. If left unspecified, the RADIUS standard port number of 1812 will be used.
+The hostname or IP address of the RADIUS server. The hostname/IP address can be followed by a colon and the port number on the server. If left unspecified, the RADIUS standard port number of 1812 will be used.  An IPv6 address must be enclosed in brackets if a port was added.
 
 </dd>
 

diff --git a/content/momentum/4/modules/mail-loop.md b/content/momentum/4/modules/mail-loop.md
@@ -8,7 +8,7 @@ description: "The mail loop module provides automatic suppression of potential m
 
 The mail_loop module provides automatic suppression of potential mail loops with two standard mechanisms:
 
-*   Suppression of delivery attempts to any configured IP interfaces on the machine.
+*   Suppression of delivery attempts to any configured IP interfaces on the machine, including IPv6.
 
 *   Suppression of messages with more than a specified number of Received headers.
 

diff --git a/content/momentum/4/modules/mxip.md b/content/momentum/4/modules/mxip.md
@@ -63,7 +63,7 @@ mxip.example.		86400	IN	NS	localhost.
 
 The mxip module implements a dns_get_As hook in order to augment the DNS resolution behaviour. If your integration or deployment also implements a dns_get_As hook, then you may not be able to use the mxip module.
 
-The mxip module only supports IPv4 addresses in the hostname field of MX records. IPv6 addresses are explicitly not supported by the mxip module.
+The mxip module supports IPv4 (and IPv6 as of Momentum 5.1) addresses in the hostname field of MX records.
 
 The mxip module can be configured as follows:
 

diff --git a/content/momentum/4/modules/url-ripper.md b/content/momentum/4/modules/url-ripper.md
@@ -62,7 +62,7 @@ Explicitly specifies headers from which emails (and in turn mailbox domains) sho
 
 <dd>
 
-Describes the base domain under which prospects should be resolved.
+Describes the base domain under which prospects should be resolved. To utilize the IPv6 support added in Momentum 5.1, select a DNSBL server that supports IPv6 addresses.
 
 </dd>
 

diff --git a/content/momentum/changelog/5/5-0.md b/content/momentum/changelog/5/5-0.md
@@ -1,7 +1,7 @@
 ---
 lastUpdated: "03/01/2025"
 title: "Momentum 5.0 Changelog"
-description: "Momentum 5.0 was released on 2024-03-01. This section will list all of the major changes that happened with the release of Momentum 5.0. Depending on installation type, all changes may not be applicable"
+description: "Momentum 5.0 was released on 2025-03-01. This section will list all of the major changes that happened with the release of Momentum 5.0. Depending on installation type, all changes may not be applicable"
 ---
 
 This section will list all of the major changes that happened with the release of **Momentum 5.0**. Depending on installation type, all changes may not be applicable

diff --git a/content/momentum/changelog/5/5-1.md b/content/momentum/changelog/5/5-1.md
@@ -0,0 +1,17 @@
+---
+lastUpdated: "06/11/2025"
+title: "Momentum 5.1 Changelog"
+description: "Momentum 5.1 was released on 2025-07-01. This section will list all of the major changes that happened with the release of Momentum 5.1. Depending on installation type, all changes may not be applicable"
+---
+
+This section will list all of the major changes that happened with the release of **Momentum 5.1**. Depending on installation type, all changes may not be applicable
+
+<a name="changelog.5.1.table"></a>
+
+| Type | Ticket | Description |
+| --- | --- | --- |
+| Fix | | |
+| Feature | TASK-6489 | Add IPv6 support to rbldnsd RBL lookups performed with the msys.pbp module |
+| Feature | TASK-2248 | Add IPv6 support to mail_loop module |
+| Feature | TASK-6411 | Add IPv6 support to url_ripper module |
+| Feature | TASK-6411 | Add IPv6 support to auth_radius module |
diff --git a/content/momentum/changelog/5/index.md b/content/momentum/changelog/5/index.md
@@ -1,9 +1,10 @@
 ---
-lastUpdated: "03/01/2025"
+lastUpdated: "06/11/2025"
 title: "Category File"
 type: "custom"
 name: "Momentum 5.x Changelogs"
 description: "Momentum 5.x Changelogs"
 ---
 
 * [Momentum 5.0 Changelogs](/momentum/changelog/5/5-0)
+* [Momentum 5.1 Changelogs](/momentum/changelog/5/5-1)
diff --git a/content/momentum/navigation.yml b/content/momentum/navigation.yml
@@ -1969,6 +1969,8 @@
     - link: /momentum/changelog/5
       title: Momentum 5.x Changelog
       items:
+        - link: /momentum/changelog/5/5-1
+          title: Momentum 5.1 Changelog
         - link: /momentum/changelog/5/5-0
           title: Momentum 5.0 Changelog
     - link: /momentum/changelog/4
-Original file line number
+Diff line change
@@ Expand Up @@
     <dd>
-    Describes the base domain under which prospects should be resolved.
+    Describes the base domain under which prospects should be resolved. To utilize the IPv6 support added in Momentum 5.1, select a DNSBL server that supports IPv6 addresses.
     </dd>
@@ Expand Down @@