Check your DNS configuration with MXToolbox

    1.  Access MXToolbox
      👉 Go to: MXToolbox
    2. Check MX Records (Mail Exchange)
      Click the dropdown menu to the left of the search bar and select “MX Lookup”.

    Enter your domain name (e.g., yourdomain.com) and click “MX Lookup”.

    Analyze the results:

    ✅ You should see the configured MX servers along with their priority values.

    ⚠️ Make sure they point to your email provider (for example: mx1.mail.protection.outlook.com or mx.mail.infomaniak.com).

    ⚙️ If you see the error “No MX records found”, your domain cannot receive emails.

    1. Check the SPF Record
      In the search bar, select “SPF Record Lookup”.

    Enter your domain name and run the search.

    Analyze the results:

    ✅ Your SPF record should be present, for example:

    

    v=spf1 include:spf.protection.outlook.com -all

    ⚠️ Common errors:

    • “No SPF record found” → You need to create one.
    • “Multiple SPF records found” → You should keep only one SPF record.
    • “SPF record too long” → Too many includes (limit of 10 DNS lookups).
    1. Check the DKIM Record
      Select “DKIM Lookup” from the list.

    Enter the DKIM selector + your domain.

    Example:

    

    selector1._domainkey.yourdomain.com

    Click “DKIM Lookup”.

    Expected results:

    ✅ A TXT record containing the DKIM public key.

    ⚠️ If you see “Record not found”, your domain does not have DKIM enabled.

    1. Check DMARC
      Choose “DMARC Lookup”.

    Enter your domain (yourdomain.com).

    Analyze the results:

    ✅ Example of a valid record:

    

    v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com

    ⚠️ Possible errors:

    • “No DMARC record found” → You need to create one.
    • “Invalid DMARC syntax” → The format is incorrect.
    1. Check Basic DNS Records (A, CNAME, TXT)
      Select “DNS Lookup”.

    Enter your domain.

    Verify that:

    • The A record points to your hosting server IP address.
    • The CNAME and TXT records are consistent with your email provider (Microsoft, Google, Infomaniak, OVH, etc.).
    1. Run a Global Email Test
      Go to “SuperTool” on MXToolbox.

    Enter your domain name (e.g., yourdomain.com).

    The tool automatically runs several tests:

    • MX
    • SPF
    • DKIM
    • DMARC
    • Blacklist

    Review the results in the final table:

    ✅ Green = OK
    ⚠️ Orange = Needs attention
    ❌ Red = Problem to fix

    1. (Optional) Test Outgoing Email
      You can also run an Email Health Check:

    Go to: MXToolbox Email Health Check

    Enter your domain name.

    The tool provides a full diagnostic of email deliverability and DNS or SMTP issues.

    Tags
    Check DNS
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