i read some of the loooong discussions here for pro and against SMIME;
but at the end of the day it could be a good feature to have “signing” of eMails and (PDF-)documents…
This time it’s really expensive to get a “known” Certificate which allows to sign your PDF-Documents and so on…
The same to SMIME for signing eMails: It’s better than nothing, and better as signing with a PGP-Key which is not trusted by anyone, because the Key was not signed by another User.
( And do you like to show others who is your social network / where you let sign your key and who thinks that you’re “trustfull” - only by signing an eMail…? )
I really think there are more positive as negative Points to setup the support for Creating Certificates for eMail-Adresses… in particular for signing PDF-Documents and so on.