add support for specifying whole domains for passthrough recipients

CHANGELOG.md

@@ -28,6 +28,9 @@
 - fix checking for required DNS records
   ([#412](https://github.com/deltachat/chatmail/pull/412))
 
+- add support for specifying whole domains for recipient passthrough list
+  ([#408](https://github.com/deltachat/chatmail/pull/408))
+
 - add a paragraph about "account deletion" to info page 
   ([#405](https://github.com/deltachat/chatmail/pull/405))
 

chatmaild/src/chatmaild/filtermail.py

@@ -142,6 +142,15 @@ async def asyncmain_beforequeue(config):
     Controller(BeforeQueueHandler(config), hostname="127.0.0.1", port=port).start()
 
 
+def recipient_matches_passthrough(recipient, passthrough_recipients):
+    for addr in passthrough_recipients:
+        if recipient == addr:
+            return True
+        if addr[0] == "@" and recipient.endswith(addr):
+            return True
+    return False
+
+
 class BeforeQueueHandler:
     def __init__(self, config):
         self.config = config
@@ -205,7 +214,7 @@ def check_DATA(self, envelope):
             if envelope.mail_from == recipient:
                 # Always allow sending emails to self.
                 continue
-            if recipient in passthrough_recipients:
+            if recipient_matches_passthrough(recipient, passthrough_recipients):
                 continue
             res = recipient.split("@")
             if len(res) != 2:

chatmaild/src/chatmaild/ini/chatmail.ini.f

@@ -39,7 +39,7 @@
 passthrough_senders =
 
 # list of e-mail recipients for which to accept outbound un-encrypted mails
-# (space-separated)
+# (space-separated, item may start with "@" to whitelist whole recipient domains)
 passthrough_recipients = [email protected] 
 
 #

chatmaild/src/chatmaild/tests/test_filtermail.py

@@ -121,6 +121,30 @@ class env2:
     assert "500" in handler.check_DATA(envelope=env2)
 
 
+def test_passthrough_domains(maildata, gencreds, handler):
+    from_addr = gencreds()[0]
+    to_addr = "[email protected]"
+    handler.config.passthrough_recipients = ["@x.y.z"]
+    false_to = "[email protected]"
+
+    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    # assert that None/no error is returned
+    assert not handler.check_DATA(envelope=env)
+
+    class env2:
+        mail_from = from_addr
+        rcpt_tos = [to_addr, false_to]
+        content = msg.as_bytes()
+
+    assert "500" in handler.check_DATA(envelope=env2)
+
+
 def test_passthrough_senders(gencreds, handler, maildata):
     acc1 = gencreds()[0]
     to_addr = "[email protected]"