different choices to the SSL_verify_mode variable

[m...@smtp.fakessh.eu]

hello list
hello folks
hello all the guru to this list

here I am with a question that is both simple and complicated
for a single server using perl
like this with self signed certificat
my $server = IO::Socket::SSL->new( Proto => 'tcp',
                                  LocalPort => $PORT,
                                  Listen => 5 ,
                                  SSL_verify_mode => 0x00,
                                  SSL_key_file => '/tmp/ssl/key.txt',
                                  SSL_cert_file => '/tmp/ssl/cert.txt',
                                  Reuse => 1);

 how to position the variable SSL_verify_mode in the different choices it 
offers

nb : perldoc IO::Socket::SSL
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