OP here, I'm sorry but I noticed that i made a couple of mistakes:
a) the email address I submitted with the above bugreport no longer
exists. Please use this one instead.
b) I though that enigmail broke after a recent upgrade, but according to
it seems that the last jessie upgrade of the package (a security
upgrade) was actually on 22 Nov 2015 (really!?!?)
Left with that, I currently have no more ideas how to find the real
source of the problem. Since we are using enigmail for work, this is an
outright desaster. I would appreciate any help in troubleshooting and
finding the actual cause of the problem.
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