gpg syntax bad character value error

Dear Team,

I am writing this mail due to a syntax error in W3C HTML5 validation.
I've just found that '<' character is considered an error even if it is
between <p> </p> markers. According to gpg encryption, this character
must be used, and I am forced to change this character to get error-free
validation. Can you please double-check this issue ?

Thank you for your help,

Best regards,

Danielsson,