make disable_ipv6 optional (and default to false) to not break existing chatmail.ini's unneccessarily

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog for chatmail deployment 
 
-## untagged
+## 1.4.0 2024-07-28
 
 - Add `disable_ipv6` config option to chatmail.ini.
   Required if the server doesn't have IPv6 connectivity.

chatmaild/src/chatmaild/config.py

@@ -30,9 +30,7 @@ class Config:
         self.passthrough_recipients = params["passthrough_recipients"].split()
         self.filtermail_smtp_port = int(params["filtermail_smtp_port"])
         self.postfix_reinject_port = int(params["postfix_reinject_port"])
-        self.disable_ipv6 = (
-            True if params.get("disable_ipv6").lower() == "true" else False
-        )
+        self.disable_ipv6 = params.get("disable_ipv6", "false").lower() == "true"
         self.iroh_relay = params.get("iroh_relay")
         self.privacy_postal = params.get("privacy_postal")
         self.privacy_mail = params.get("privacy_mail")