Mail Tester
Generate a unique email address, send a message to it, and get a full SPF, DKIM, and DMARC report.
https://serveradmin.tools/en/email-tester

Email Deliverability & Spam Tests
Why are my emails going to Spam?
Emails land in the spam folder primarily due to poor sender reputation, missing DNS authentication records, or triggering spam filters with specific keywords. Using an email tester helps you identify these exact issues before sending a real campaign.

SPF, DKIM, and DMARC?
SPF authorizes specific IP addresses to send mail on behalf of your domain. DKIM adds a cryptographic signature to verify the email integrity. DMARC ties them together, giving you control over how receiving servers handle unauthorized messages.

SpamAssassin score work?
SpamAssassin evaluates emails using hundreds of rules analyzing headers, body text, and HTML formatting. A lower score is always better. If your score exceeds a certain threshold, your message will likely be flagged as spam.