The 'Security' option allows you to choose whether you want to receive any emails formatted in HTML as opposed to plain text.
Click the 'Security' drop-down box to view the options associated in it. The options listed are:
'Disable all HTML codes in incoming mail': By selecting this options all the mails you receive are formatted as text only. If any person sends you an email in HTML format, the HyperOffice application renders that email as text only.
'Allow HTML in Incoming mail': This option formats the email you receive as HTML code. This option might be useful for displaying tables, Font styles etc.