Run Your First Deliverability Test

Deliverlens is meant to answer one question quickly: what does this exact message look like when mailbox providers inspect it?

Step 1: Generate a test inbox

  • Open the home page.
  • Create a disposable inbox.
  • Copy the generated address exactly as shown.

Step 2: Send one representative message

  • Use the real provider or SMTP relay you care about.
  • Keep the normal From domain, subject, body, and links.
  • Do not forward a message from another inbox; send it directly.

Step 3: Wait for analysis

  • The report page will stay in an analyzing state until the inbox is fetched.
  • Once the message is stored, Deliverlens evaluates authentication, content, headers, and transport signals.

Step 4: Read the report in the right order

  1. Authentication: SPF, DKIM, DMARC
  2. Transport and DNS: MX, PTR, HELO, TLS-related checks
  3. Content and links: subject quality, URI warnings, SpamAssassin signals
  4. Attachments and message structure

What a good first test looks like

  • Sent from the production sender identity
  • Uses the exact links you plan to ship
  • Includes the same tracking and unsubscribe behavior
  • Avoids internal forwarding or mailbox rules

Common first-run mistakes

  • Testing from Gmail while diagnosing your ESP domain
  • Sending from a sandbox domain that is not used in production
  • Treating a cached old report as the latest send
  • Looking at content warnings before fixing authentication failures

Once the first report is clean, save that sender configuration as your baseline before making more campaign changes.