S/MIME is about the mail (content) itself, not the transport. For the transport part there are things like (START)TLS and MTA-STS. With S/MIME you include your certificate in the mail and can either sign the mail with a signature (with your private key, others can verify it using your public key from the certificate) or encrypt the mail (with the receiver's public key, so only he can decrypt it using his private key). Certificate trust is determined normally via the CA chain and trusted CAs.
It didn't need to in my simple case. k6 doesn't do crawling / auto-discovering, from what I can tell - I just wanted to give the tool one URL and press start.
Funny timing. Just yesterday I was looking for an easy Windows tool to do a simple stress-test on a website (legally ofc). A requirement of mine was to just give it the root URL and the tool should discover the rest automatically (staying on the same domain). Also, parameters like parallelism had to be easily manageable.
After trying some crawlers / copiers and other tools I went back to a simple one I already knew from saving static copies of websites in the past: HTTrack. It fit the bill perfectly!
You can add the root URL, set it to "scan only" (so it doesn't download everything) and tweak the settings like connections and speed (and even change some settings mid-run, save settings, pause, ...). So thanks xroche for HTTrack! :)
I also use HeidiSQL almost daily. Besides MySQL / MariaDB it also can connect to MSSQL and Postgres.
I recently had to import a CSV with some million rows into MariaDB. Neither HeidiSQL nor DBeaver could do it (tried various settings). IntelliJ worked like a charm.