Email protection breaks send/receive of Microsoft Live Mail with NIS 2011

I upgraded from NIS 2010 to NIS 2011 and my e-mail stopped working.  I have worked around this problem by disabling NIS's email protection - and e-mail works fine again.  I use Microsoft's Windows Live Mail on Windows 7 64-bit with Verizon's FIOS as my ISP.  I would like to be able to enable this feature.  Can anyone think of anything that I can try?