Is your domain on a blocklist?

Enter your domain. We check it, and the servers your mail comes from, against the public blocklists that answer automated queries, alongside SPF, DKIM, DMARC and MX.

Free, no account needed. Results in about 10 seconds.

About the Blocklist check

Blocklists are shared lists of domains and IP addresses seen sending spam. Many receivers check them, so a listing can send all your mail to spam or get it rejected.

Some lists refuse automated queries, so no free checker can see every list. We show which lists answered, rather than implying a clean result we couldn't confirm.

Fix it, then keep it fixed

Flaiir checks your whole domain for free, can write missing SPF and DMARC records at your DNS provider, and warms your mailbox while it watches where your mail lands.

Check my domain