Welcome Susan
First of what version of incredimail are you currently running on your computer. If its an older version you may try updating to the latest version. Have you tried uninstalling incredimail and then reinstalling it to see if that can fix your hyperlink error. Try running system restore, back to the point before you first installed Zone Alarm. Zone Alarm may still be port blocking or stopping Incredimails hyperlinks, so a fresh install may be the best solution if system restore fails to help. Just make sure that you back up your address book and other essentials.

I hope this helps but I do not use this program, so someone that does may be able to give you some more insight