Sender Smart Categories: Classify a Sender Once

What it is

Sender Smart Categories moves the classification decision from the individual email to the sender. Instead of running every incoming message through your category prompts, AI Email Filter classifies a sender once and caches the result. The next email from that address is sorted using the cached decision — no extra LLM call, no re-evaluation.

The problem it solves

Per-email classification works, but it re-asks the same question for senders you get mail from constantly: your accountant, a recurring vendor, a mailing list you’re already subscribed to. That’s wasted LLM calls for outcomes that were already decided, and it opens the door to inconsistency — the same sender landing in different folders depending on how a given email happens to read.

How it works in AI Email Filter

• The first email from a new sender goes through your category prompts as usual — for example “Cold outreach, LinkedIn spam, or someone trying to sell me something” for Spam & Sales.
• That decision is cached against the sender. Every subsequent email from the same address is sorted instantly, without another classification call.
• You can re-categorize any sender at any time if their emails start being about something else.
• Caching keeps decisions consistent — a sender doesn’t bounce between folders because two of their emails happened to read differently.
• This works the same regardless of which mailbox you connect — Gmail and Google Workspace, Yahoo, ProtonMail via Bridge, Fastmail, Mailcow, or a self-hosted server all speak IMAP/SMTP (Outlook/Microsoft 365 support is coming soon via Microsoft sign-in), and Sender Smart Categories doesn’t care which one you’re on.

Accuracy still comes down to how clearly your category prompts describe what belongs in each folder. Sender-level caching doesn’t fix a vague prompt — it just makes sure a good one keeps paying off on every email from that sender instead of only the first.

This matters most once your inbox has real repeat traffic: clients, vendors, recurring newsletters. If you’re sorting mail for more than one client or project, see how Sender Smart Categories fits into managing email as a freelancer or small business.

AI Email Filter includes 200 free classifications to try this on your own inbox, no credit card required. Full pricing starts at $6/month for unlimited classifications.