Email Tools Library

Each tool below helps you check one of the core deliverability components. They're lightweight, free, and require no login.

Check if an SPF record is valid. Includes recursive lookup count.

Check if an IP is authorized to send email for a domain. Includes recursive lookup count.

Validate DKIM records by domain and selector. Confirms existence and encryption strength.

Coming soon: validate your domain’s DMARC policy and reporting setup.

Check if your domain enforces secure transport (MTA-STS) for incoming email.

See if your domain has a valid BIMI record and logo setup.

Check if your sending IP has a valid reverse DNS record — critical for inbox delivery.

Paste full email headers or the full raw message. We’ll analyze the Microsoft 365 anti-spam headers to explain delivery outcome.

Paste an email header to trace routing, delays and spam filtering.

Quickly check any DNS record type (A, TXT, MX, etc) across your domain setup.