Those using PGP for encrypting/signing emails are probably familiar with PGP keysigning parties.
Recently I started using PIUS https://github.com/jaymzh/pius/ for signing the keys & sending the signed key via email to the intended recipient. Most folks are probably familiar with caff (https://www.mankier.com/1/caff)
I find that the installation and configuration is quite straight forward. To make sure that pius works with your mail server, you probably should configure your email settings in ~.pius/piusrc
Here's how mine looks like:
Note that I've also included my default signing key id up there so that I can just do:
And you'll then be prompted with the password of your mail server
There are some other options so do check out the man page or do a pius --help