chore(release): prepare for 0.6.4 (#130)

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>

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

filtermail/Cargo.lock

@@ -462,7 +462,7 @@ checksum = "28dea519a9695b9977216879a3ebfddf92f1c08c05d984f8996aecd6ecdc811d"
 
 [[package]]
 name = "filtermail"
-version = "0.6.3"
+version = "0.6.4"
 dependencies = [
  "async-trait",
  "base64",

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"