nixpkgs.pgp-tools seems to require a local MTA to send keys with UIDs signed to the corresponding email addresses. (It uses perl's
Mail::Mailer for that.)
How can I set up a local MTA on my Laptop running NixOS? Can and should I use the
networking.defaultMailServer.* options, which seem to configure sSMTP?
As I use my Laptop as a personal computer, I'm not looking for how to set up a full-blown email server (with multiple accounts/users, mailboxes, etc.). However, to be usefull for
caff, mails should obviously be sent out (using the same remote SMTP server as my MUA uses), not just delivered to a local directory or something.