>Here's how I do it in thunderbird. Sort by sender (or other thing). Click first email. Shift click last email. Do whatever I want (usually archive or move to a

>Here's how I do it in thunderbird. Sort by sender (or other thing). Click first email. Shift click last email. Do whatever I want (usually archive or move to a folder). This is pretty basic functionality for an email client to have. In GMail (Proton and Yandex too; probably any modern web client) works by clicking the checkbox. Click first email's checkbox. Shift click last email's checkbox.