Free SPF, DKIM & DMARC checker
Test the DNS records that decide whether providers trust your email — SPF, DKIM, DMARC, MX, and reverse DNS — with copy-paste fixes for anything that fails.
Why these records matter
Every receiving mail server asks the same three questions: is this sender allowed to send for this domain (SPF)? Is the message signed and untampered (DKIM)? And what does the domain owner want done with failures (DMARC)? Since Google and Yahoo tightened sender requirements, missing authentication doesn't just hurt your placement — for bulk senders it means outright rejection.
Passing records are the foundation, not the finish line. Providers then judge your reputation: whether real people open, answer, and keep your mail out of spam. New domains and mailboxes have no such history — which is what email warmup builds.
Frequently asked questions
What do SPF, DKIM, and DMARC actually do?
SPF lists which servers may send email for your domain. DKIM cryptographically signs your messages so receivers can verify they weren't altered. DMARC tells receivers what to do when SPF or DKIM fails, and where to send reports. Together they prove you are who you claim to be — without them, providers treat your mail with suspicion.
Are these records required in 2026?
Effectively yes. Since 2024, Google and Yahoo require SPF or DKIM for all senders, and both plus DMARC for bulk senders (5,000+ emails/day). Missing authentication is one of the most common reasons legitimate email lands in spam.
My records pass — why is my email still going to spam?
Authentication is the entry ticket, not the seat. Placement is decided by your sender reputation: engagement, complaints, volume patterns, and history. If your records pass but you still hit spam, your reputation needs building — that's what email warmup does.
Is this checker really free?
Yes — no account, no email required, rate-limited to keep it fast for everyone. If you want continuous monitoring with alerts when records change or break, that's included in the EmailWarmer platform, free for one mailbox.