it seams that gpgOL does not have the option to use SMIME as default until now if there both SMIME and PGP public keys are stored for the recipient.
I tested it in gpgOL 2.2.0 (gpg4win 3.1.2).
When will this function be available?
I’ve now put it on the agenda for Gpg4win-3.2.0 (see: https://dev.gnupg.org/T3961 )
For me it will help to implement new options when I have the new config dialog https://dev.gnupg.org/T3944 because the current dialog is “native winapi” and not really dynamic.
E.g. I would need to disable such an option when S/MIME is disabled, so having a dynamic config dialog will help.