I'm not especially hard to reach. I'm just slightly more likely to answer if your message has an actual thought in it.
If you want to talk to me about linux, infrastructure, self-hosting, mail, weird internet things, projects, or something you read on here, go ahead.
I usually prefer text first. It works better for links, logs, context, and not having to repeat everything twice.
You do not need to write a formal introduction, optimize your wording, or pretend to be more professional than you are.
A simple “Hey, I saw your site and wanted to ask about x” is completely fine.
I may reply quickly, or after a bit, depending on life, work, and whether I am currently being held hostage by something unnecessarily technical.