Frequently asked questions

You get a random address at in.mailtester.x1.ax. Our mail server accepts whatever is sent to it and analyses the message right away: we check whether your sender is properly authenticated (SPF, DKIM, DMARC), whether the sending server has a good reputation (reverse DNS, blacklists) and whether the content shows typical spam patterns (SpamAssassin, HTML, links, headers).

The message is never forwarded.

Every test starts at 10 points. For each problem we find, points are deducted – you can see how many at every single check. 9 points and more is excellent, 7 and more is good, 5 and more needs work; below that the mail will probably end up in spam.

No. Large providers such as Gmail or Outlook also look at your sending history, complaints and how your recipients react. A good score means: technically, everything is set up so that nothing speaks against your mail.

Anyone who knows the exact test address or the link to the result. The address is random and practically impossible to guess. Result pages are excluded from search engines. You can delete the test yourself at any time.

7 days at most. After that the mail and the analysis are deleted automatically. The “Delete test now” button removes them immediately.

There is no fixed daily quota. To protect the service against abuse, the operator may limit usage per internet connection; if so, you will see a corresponding notice.

Yes. A new mail to the same address replaces the previous result. For a before/after comparison it is better to use a new address each time.

We block remote images at first because fetching them tells the sender that the message was opened – usually harmless for your own mail, but a risk with untrusted content. One click loads them. Scripts in mails are never executed.

Yes. /api/v1/tests/<test-id> returns the complete result as JSON once the analysis has finished. The same rules apply to the API as to the website.