Free tool
Will your mail reach the inbox? Check your domain
Type a domain to see what receivers such as Gmail, Outlook and Yandex find when your letters arrive: MX, SPF, DKIM, DMARC, the server's reverse name and the big spam blacklists — and what to fix. Free, no account, nothing stored.
What is checked
- MX
- The domain receives mail: replies can reach it, and spam filters trust it more.
- SPF
- One TXT record naming the servers allowed to send for the domain, ending in ~all or -all.
- DKIM
- A published key that lets receivers verify each message's signature.
- DMARC
- The rule for mail that fails SPF and DKIM: report it, put it in spam or refuse it.
- PTR
- The sending server's reverse name, leading back to its address — mail providers expect one.
- Blacklists
- Spamhaus, SpamCop and Barracuda: whether the server's address is listed as a spam source.
Questions and answers
What do SPF, DKIM and DMARC do?
SPF names the servers allowed to send for your domain, DKIM signs each message so it cannot be changed on the way, and DMARC tells receivers what to do with mail that fails them. Gmail and Yahoo expect all three from senders.
Why is DKIM "not found" although I have it?
A DKIM key lives under a name (selector) only your provider knows. The check tries the usual ones; if yours is unusual, open a message you sent, show its original and look for "s=" in its DKIM-Signature line.
What is the outgoing server field for?
It is the server your mail is sent through (SMTP), for example mail.yourdomain. With it, the check also tells whether SPF lets that server send. Left empty, the domain's own mail server (its MX) is checked for its reverse name and blacklists.
Do you store the domains I check?
No. The check asks the public DNS and shows the answer; neither the domain nor the result is kept.
Can my mail be checked automatically?
Yes: connect your mailbox to Stjobno Mail, and its sending is checked once a day by itself; the settings show what to fix.
Guides
Bring all your mail together
Free, in a minute: sign in and add your first mailbox.