Sometime circa 1998 there was a group looking for new technical hires for startups they invested in. They posted somewhere, perhaps /., that they were accepting résumés via SMTP on a non-standard port, as a filter mechanism.
I never heard back, although I ended up working for one of their companies the next year anyway.
Around the same time people sometimes posted job openings in the html source of their websites. I never answered any, 'cause I wasn't looking for technical jobs at the time, but it always seemed clever to me.
Any, and only, nerds who were interested in web development incessantly "View Source"ed on every page that looked interesting. It was a major vector by which early-web frontend techniques spread themselves, and it was great: you could cut-and-paste the html, direct download the .css and other resources, and get an offline model of their site running for you to tinker with to learn their secrets. All the magic was out in the open (for those who cared to pull back the curtain), and the future seemed limitless.
I never heard back, although I ended up working for one of their companies the next year anyway.