Metre2 Mail - free, with Pro extras
Rules sort mail as it arrives: supplier invoices to Accounts, newsletters out of the way, anything from the boss flagged. Three rules are free, and the commonest one is a right-click away - "Always move email from this sender to...". Mail Pro has no limit.

Sheet 013 free rulesUnlimited with Pro
Right-click an email from the sender (or open More) and choose Always move email from this sender to...
Choose the folder. The rule is made, and Mail offers to move the emails from that sender already in the folder.
Settings > Rules > New rule: when from, to, subject or anywhere contains - or doesn't contain - some words, all or any of them, and only with attachments if you like.
Move it to a folder, mark it read, flag it, archive it, delete it - and stop any more rules running on it.
Right-click a folder and choose Run rules on this folder to sort the email that's already in it - free.
Help: Rules and blocked senders has every option in detail.
Free, with Pro extras. The parts marked Pro come with Mail Pro. Mail Pro is a one-off £9.99 upgrade inside the app, bought through the Microsoft Store - no subscription, no account. Try it free for 7 days.
Three, including the ones made with "Always move email from this sender to...". Mail Pro (a one-off £9.99) has no limit.
Nothing is deleted. The first three keep running, and the others are kept, paused, until Pro is on again.
No - imported email never runs rules or shows notifications. Use Run rules on this folder afterwards if you want them sorted.
Yes, and that's free with no limit: Block sender sends an address - or everyone at a domain - straight to Junk.
Yes. Rules and blocked senders run on new mail in the Inbox, as they do on IMAP.

Work and school mail through Microsoft Graph - even where IMAP is switched off.

PST and OST files folder by folder, .mbox and .eml too - duplicates skipped.

Summaries free; reply drafts and translations with Pro - nothing leaves your PC.

Pin to the top with P, free. Colour-code with C in Mail Pro.

Blueprint paper in light, deep navy in dark - every email on clean paper.

Tracking pictures hidden, links cleaned, every email sandboxed, fakes flagged.
Metre2 Mail is free. Mail Pro is a one-off £9.99, with a free 7-day trial.