thunderbird/enigmail key fetch with polipo + tor

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i am trying to fetch PGP keys from a keyserver using standard hkp protocol.  i 
have thunderbird configured to use tor and polipo.  enigmail has a setting 
"extensions.enigmail.respectHttpProxy".  if this setting is "true", i can't 
fetch keys; if it is "false", all works as expected (at the price of my 
anonymity).

i've started a similar thread in the enigmail forums: 
http://mozilla-enigmail.org/forum/viewtopic.php?t=192 .  there, i've been told 
that hkp protocol will work over an http proxy.  can anyone verify this 
behavior and possibly track down a solution?

if it's of any use, i am actually using PortableThunderbird 1.5.0.8 and the 
Polipo win32 binary.  however, i might assume this is irrelevant.
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iD8DBQFFdOqEXhfCJNu98qARCJ/0AKDVmzRO/uNGK294Iz3KyGvrPfRFpACg6lWB
/Ru1ryNXvIdlNCceeWYaLBU=
=fKRw
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