Inbound mail, junk values in form of Chinese alphabets due to hyperlinks in the email body

My requirement is to read the  email body of a SAP inbound mail and to store it into text format in an internal table.

I am using interface IF_INBOUND_EXIT_BCS, to process the inbound mail. I have used method cl_crm_email_utility_base=>convert_html_to_plain_text to convert html string (email body) to plain text string and then function module 'SCMS_STRING_TO_FTEXT' to convert string into an internal table.

The issue is that the signature of the sender contains hyperlinks, which are not getting converted to plain text properly, and as a result I am getting junk values (in the form of chinese alphabets) in the internal table.