Enhanced Email Validation Test Results:
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Invalid email format: gmail.com24
Valid email: test@gmail.com
Valid email: user@example.org
Invalid email format: invalid.email
Invalid email format: test@
Invalid email format: @gmail.com
Invalid email domain format: test@gmail.com24
Invalid email domain format: abc@gmail.com24
Valid email: test.email@domain.co.uk
Valid email: user@subdomain.example.com
Valid email: test@domain123.com
Invalid email format: user@test.123
Invalid email format: test@example
Invalid email domain format: user@example.c