Here’s some interesting and useful content about — beyond just the basic steps. 🎭 Opera Mail: A Forgotten Gem (But Still Alive for Some) Opera Mail was not just an email client — it was part of the Opera browser (versions 12.x and earlier) as a built-in M2 email client . Unlike standard webmail, it used a unique "views" system" (labels, filters, search-based folders) — way ahead of its time.