A local-first spam filter for Outlook, Apple Mail, and Thunderbird. Free for individuals, and your mail never leaves your computer.
One local hub, every inbox. Thin add-ins in your mail apps feed a single filter that runs on your machine.
See a junk message in your mail app, the same as always.
One click builds a rule from the sender and any links in the message.
Spam Blaster removes matching messages from your Junk folder on your machine.
Spam Blaster is built so your mail stays yours.
Everything runs on your computer. The service listens only on 127.0.0.1 and is not reachable from the web.
Your rules and block events live in an encrypted local database. The key stays in your OS keychain.
Mailbox tokens and the dashboard token live only in the OS keychain, never in plaintext on disk.
Block logs keep only the sender name, the address domain, and the matched pattern. Never subjects or bodies.
No analytics, no tracking, no usage pings. Nothing about your mail leaves your machine.
Read the full Privacy Policy.
Mailboxes: Microsoft 365, Gmail, IMAP. Runs on Windows and macOS.
Select a spam message, click Blast, and watch it go. Review every rule and every blocked message in the dashboard, on every mail app.
Spam Blaster is free for individuals. If it keeps your inbox clean and you want to help it grow, you can chip in.
Sponsor on GitHub