diff --git a/tests/plugins/email_address_test.py b/tests/plugins/email_address_test.py
index d33b3b4f..89e452ae 100644
--- a/tests/plugins/email_address_test.py
+++ b/tests/plugins/email_address_test.py
@@ -52,6 +52,57 @@ class TestEmailAddressDetector:
             ('user@gmail.com', True),
             ('user@yahoo.com', True),
             ('user@hotmail.com', True),
+
+            # Additional test cases
+
+            # Valid email addresses with different domain extensions
+            ('user@domain.co.uk', True),
+            ('user@domain.io', True),
+            ('user@domain.org', True),
+            ('user@sub.domain.com', True),
+
+            # Valid email addresses with numbers
+            ('user123@example.com', True),
+            ('123user@example.com', True),
+            ('user123@123example.com', True),
+
+            # Valid email addresses, part of larger text with special characters
+            ('Contact us at: user@example.com!', True),
+            ('Email: user@example.com for more info.', True),
+
+            # Invalid email addresses with missing components
+            ('user@example', False),
+            ('user@.example.com', False),
+            ('@example.com', False),
+            ('user@', False),
+
+            # Invalid email addresses with special characters
+            ('user@exa*mple.com', False),
+            ('user@examp!e.com', False),
+            ('user@exampl$.com', False),
+            ('user@exam^ple.com', False),
+
+            # Unusual formats, mark as false
+            ('"user"@example.com', False),  # Quoted local part
+            ('user@[123.123.123.123]', False),  # IP address domain
+
+            # Invalid email addresses, incorrect use of special characters
+            ('user@exa,mple.com', False),
+            ('user@examp<le.com', False),
+            ('user@exampl>com', False),
+            ('user@exampl;e.com', False),
+
+            # Edge cases - rare but valid email formats
+            ('user+mailbox/department=shipping@example.com', True),
+            ('customer/department=shipping@example.com', True),
+            ('!def!xyz%abc@example.com', True),
+            ('_Yosemite.Sam@example.com', True),
+
+            # Edge cases - position of . (dot)
+            ('user@example..com', False),  # Double dot in domain
+            ('.user@example.com', True),  # Leading dot in local part
+            ('user@.example.com', False),  # Leading dot in domain
+            ('user@example.com.', True),  # Trailing dot in domain
         ],
     )
     def test_analyze_line(self, payload, should_flag):