AI Email Filter

AI Email Filter is the odd one out in this category, and it says so itself: it is not a mailbox.

It connects to an IMAP mailbox you already have, with Mailbox.org, Posteo and Fastmail named in its own documentation, reads each incoming message and moves it to the folder whose description fits best. You write those descriptions in plain language, so a folder can be "invoices and receipts" rather than a stack of sender rules that break when a company changes its address.

The product is run by Reto Odoni from Zürich, whose imprint names him as the owner; no company form or registry number is published, which is thinner than most entries here.

Pricing is $6 a month or $60 a year after 200 free classifications, which the site describes as a one-time trial.

Subject, sender and date are kept for history and undo, email bodies are not stored, and you can point the classifier at your own LLM or self-host the dockerised stack. Hosting in Finland is the vendor's statement and is not published on the site. Judge it as an add-on to a provider from this list, not as a replacement for one.

What AI Email Filter does well

• Prompts in plain language instead of fragile if-then rules
• Works on any IMAP mailbox, so it sits on top of Posteo or Mailbox.org
• Bring your own LLM or self-host, so mail content can stay on your infrastructure
• Every move is logged and can be undone in one click
• Free test of 200 classifications, no credit card

Where AI Email Filter falls short

• Not an email provider: it stores no mailbox and replaces none of the others here
• Mail content reaches its servers and an LLM unless you self-host or bring your own
• Sole-owner operation, with no company form or registry number published
• The free allowance is a one-time trial, then $6 a month, and Outlook is still to come

Standout feature. It is the only entry here that adds AI sorting to a mailbox you already have, rather than being the mailbox.