@burnout426 I'm quite highly surprised that 9 years after the last update of operamail (1.0.1044) people are asking for it! That raises the question about the motivation of people to ask for this. E.g. the sheer good usability of the mail program (based originally on its standard integration in the presto browser). Or the fantastic concept of this mail client. The very quick search results etc pp. I think it would make sense to take the inquiries seriously. Perhaps the inquiries are also related to disliking clients like Thunderbird. Who knows?
Vivaldi is okay and could be my successor client, but the import of old operamail resets all mails in the state of unread. And the operation is not so intuitive as of operamail.
I came into this thread by an internet search using "source code operamail 1.0". This code is such old that I ask: why isn't it made open source? A first step could be to overhaul the code using e.g. Claude, in order to let it meet today's TLS and other requirements. And last but not least: to let also include MAC and linux as installation options.