diff --git a/filtermail/CHANGELOG.md b/filtermail/CHANGELOG.md
index 1e5d38ef..afafcafd 100644
--- a/filtermail/CHANGELOG.md
+++ b/filtermail/CHANGELOG.md
@@ -1,3 +1,16 @@
+## 0.6.4 - 2026-05-01
+
+### Bug Fixes
+
+- Implement missing "implicit MX" rule
+
+### Features
+
+- Https transport channel (#122)
+
+### Refactor
+
+- *(transport)* Explicitly handle RFC7505 null MX
 ## 0.6.3 - 2026-04-20
 
 ### Features
diff --git a/filtermail/Cargo.lock b/filtermail/Cargo.lock
index 122f887d..b3649b64 100644
--- a/filtermail/Cargo.lock
+++ b/filtermail/Cargo.lock
@@ -462,7 +462,7 @@ checksum = "28dea519a9695b9977216879a3ebfddf92f1c08c05d984f8996aecd6ecdc811d"
 
 [[package]]
 name = "filtermail"
-version = "0.6.3"
+version = "0.6.4"
 dependencies = [
  "async-trait",
  "base64",
diff --git a/filtermail/Cargo.toml b/filtermail/Cargo.toml
index 69ae0b94..54f497cf 100644
--- a/filtermail/Cargo.toml
+++ b/filtermail/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "filtermail"
-version = "0.6.3"
+version = "0.6.4"
 edition = "2024"
 license = "MIT"
 readme = "README.md"