Do you still have access to your bug tracker account? Can you update
your email address here?
Yes I do. I've just gone ahead and updated my bug tracker account to
reflect this, thank you.
[...] is not able to sign his mails and seems to ignore requests of
doing so [...]
Frankly I'm not quite sure what that would prove. If I don't have a known
signature on record, signing these emails doesn't do anything to verify my
identity. To imply that I'm "ignoring requests" is a bit disingenuous when
you consider that a PGP signature would change nothing here.
All the best,