Remove Yahoo dash address normalization

.github/workflows/testing.yaml

@@ -1,5 +1,11 @@
 name: Testing
 on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'setup.*'
+      - '*.md'
+      - '*.rst'
   push:
     branches: ["*"]
     paths-ignore:

email_normalize/__init__.py

@@ -197,8 +197,6 @@ async def normalize(self, email_address: str) -> Result:
                 local_part = local_part.replace('.', '')
             if provider.Flags & providers.Rules.PLUS_ADDRESSING:
                 local_part = local_part.split('+')[0]
-            if provider.Flags & providers.Rules.DASH_ADDRESSING:
-                local_part = local_part.split('-')[0]
         return Result(email_address, '@'.join([local_part, domain_part]),
                       mx_records, provider.__name__ if provider else None)
 

email_normalize/providers.py

@@ -12,7 +12,7 @@ class Rules(enum.Flag):
     Used to determine how to normalize provider specific email addresses.
 
     """
-    DASH_ADDRESSING = enum.auto()
+    NONE = 0
     PLUS_ADDRESSING = enum.auto()
     LOCAL_PART_AS_HOSTNAME = enum.auto()
     STRIP_PERIODS = enum.auto()
@@ -55,7 +55,10 @@ class Rackspace(MailboxProvider):
 
 
 class Yahoo(MailboxProvider):
-    Flags: Rules = Rules.DASH_ADDRESSING
+    # No normalization rules — Yahoo disposable addresses use the format
+    # nickname-keyword@, where the nickname alone is not a deliverable
+    # address. See https://help.yahoo.com/kb/SLN28815.html
+    Flags: Rules = Rules.NONE
     MXDomains: typing.Set[str] = {'yahoodns.net'}
 
 

tests/test_normalize.py

@@ -111,7 +111,7 @@ def test_yahoo(self):
         address = '{}@{}'.format(local_part, domain_part)
         mx_records = [(1, 'mta5.am0.yahoodns.net')]
         self._perform_test(
-            address, '{}@{}'.format(local_part.split('-', 1)[0], domain_part),
+            address, '{}@{}'.format(local_part, domain_part),
             mx_records, 'Yahoo')
 
     def test_yandex(self):