The only email client I’ve used recently, for my gmail mailbox, was “geany” - worked well - but - I mostly can’t be arsed with mail clients - I ONLY use GMail through the web client - does everything I need (even if it is clunky, and a bit funky, compared to Outlook [I kinda hate Microsoft, or Windows more specifically] but MS Outlook runs rings around Google’s offering)…
I’ve got PST files and Eudora inbox archives stored on my NAS dating back 25+ years - but I never need them…
I kinda hate how the main distros I use, or tried recently (Ubuntu, Pop!_OS, Mint), insist on giving me Thunderbird - I ain’t got no use for it and first thing I do is remove it from my dock/panel.