Mail domain check
We check how mail is set up for a domain and explain what to fix. Free, no sign-up.
What we check and how
Only public DNS records and the MTA-STS policy file, which mail servers read before delivery anyway. Our own resolver verifies the DNSSEC signature. We keep the result for 10 minutes so as not to check the same thing twice, and we do not link it to you. The domain is sent in the form, not in the page address, so it does not end up in server logs.