After sending out a request for an e-signature I usually get a few SPAM e-mails disguised as coming from e-signature.
I've never used e-signature and I get those Spam emails too. So the spam may be targeting tax preparers (or possibly even the general public) rather then users of e-signature.
@TaxGuyBill @14strings I believe interested parties can obtain information regarding ptin holders... This may be where the spam is coming from... The ptin program was said to be more safe than using our social security numbers...