I have been digitally signing (and encrypting, whenever possible) my official emails for sometime. While I am not extremely paranoid (but serious, certainly) about cryptographic security, I also think signing the email is a signature [pun intended] that I take such aspects seriously. On a like-minded recipient, this could therefore make a good impression.
On the other hand, if seeing the
-----BEGIN PGP SIGNED MESSAGE-----
header has a high likelihood of annoying or confusing the person (to the point of them simply deleting my email), then I certainly do not mind sending an unsigned message.
I recently started applying for jobs (in the area of quantum information/communication to be precise) and was wondering if I should, in my first email contact with a potential employer or (postdoc) supervisor, also sign that email?