Server & Network

Mail Delivery Control – SPF, DKIM, DMARC, MX Verification

Check your domain's email delivery records for free. View MX, SPF, DKIM, DMARC, PTR, and SMTP banner checks in a single report; identify problems instantly.

Mail Delivery Audit
Information

Mail Delivery Control – Regarding SPF, DKIM, DMARC, and MX Control

Are your emails ending up in the spam folder or not arriving at all? Often, the problem stems from missing or incorrectly configured email DNS records. This free tool queries critical delivery records on the server side for any domain and provides you with a comprehensive audit report on a single page.

MX records It identifies the email servers for your domain name. SPF (Sender Policy Framework) The log specifies which servers can send emails on behalf of that domain; an incomplete or weak SPF configuration can lead to your emails being flagged as spam. DKIM (DomainKeys Identified Mail)By adding a cryptographic signature to the sent messages, it proves that the content has not been altered. DMARC It defines what to do (reject, quarantine, track) when SPF and DKIM fail; it enhances the security of both the sender and the receiver.

In addition, the tool has the IP address of the first MX server. PTR (reverse DNS) the record and received from port 25 or 587. SMTP banner It also checks the response. All results are summarized in a checklist with green (passed), yellow (warning), and red (missing/error) color coding; practical suggestions are also included for each item.

How to use it?

Step by step

  1. The one you want to check domain name enter (for example) example.com).
  2. Inspect Click the button; the server will perform DNS queries and SMTP tests.
  3. For MX, SPF, DKIM, DMARC, PTR and SMTP. green/yellow/red Review the results.
  4. Underneath each item suggestion Read the text and complete the missing entries.
FAQ

Frequently Asked Questions

SPF (Sender Policy Framework) informs recipient mail servers which IP addresses or hosts are authorized to send emails on your behalf. Missing or incorrect SPF records can cause legitimate emails to be classified as spam.

Emails can still be delivered without DKIM, but their deliverability score will be lower. Major email providers (Gmail, Outlook, etc.) more frequently mark messages without a DKIM signature as spam. DMARC compliance also requires passing at least one of the following: DKIM or SPF.

The 'p=" tag in the DMARC record defines the policy: 'none' only monitors, 'quarantine' sends failed emails to the spam folder, and 'reject' rejects them entirely. 'None' or 'quarantine' are recommended to start with; you can switch to 'reject' once the problem is resolved.

The tool tries commonly used selectors: default, google, selector1, selector2, k1, and mail. Your hosting provider or email service may use a different selector; in this case, you should consult the relevant service's documentation.

The PTR (reverse DNS) record indicates whether the MX server's IP address resolves to a hostname; a missing PTR can trigger some spam filters. The SMTP banner reveals how the server identifies itself on port 25 or 587; an incorrectly configured banner can also lead to delivery problems.
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