1081 => 'Post Office Protocol – Version 3',
1939 => 'Post Office Protocol – Version 3 (STD 53)',
2449 => 'POP3 extension mechanism',
1081 => 'Post Office Protocol – Version 3',
1939 => 'Post Office Protocol – Version 3 (STD 53)',
2449 => 'POP3 extension mechanism',