Free DNS tools

Check and build email DNS records.

Inspect public MX, SPF, DKIM, and DMARC records, then generate conservative starter records for Help4 DNS. No mailbox password, private key, or Help4 account is required.

Do not guess email senders. One incorrect SPF or DMARC record can block legitimate mail. Inventory every service that sends as your domain before moving from monitoring to enforcement.

Public email DNS checker

Domain

DKIM selector

Your mail provider supplies this name.

Checks query Google's public DNS-over-HTTPS endpoint for public DNS records only. Help4 does not request mailbox credentials or DKIM private keys.

MXNot checked

SPFNot checked

DKIMEnter a selector

DMARCNot checked

SPF starter generator

Select every system that sends mail using your domain. Help4 generates one SPF record; never publish multiple SPF TXT records at the same hostname.

Primary mail service

Website or form-sender IPv4 address (optional)

Additional provider includes (optional)

Unknown sender policy

Generated SPF

Name@

TypeTXT

Value

DMARC starter generator

Policy

Aggregate report email (optional)

Percent enforced

Generated DMARC

Name_dmarc

TypeTXT

Value

Safe rollout: publish SPF and DKIM first, monitor DMARC reports, then move gradually from p=none to quarantine and reject only after every legitimate sender aligns.

Common provider recipes

Provider	SPF starting point	DKIM	Important
Google Workspace	`include:_spf.google.com`	TXT at the selector supplied in Google Admin	Generate a 2048-bit key where supported, publish it, then start authentication in Google Admin.
Microsoft 365	`include:spf.protection.outlook.com`	Two provider-supplied CNAME records	Use the exact tenant-specific targets shown in Microsoft 365.
cPanel / website forms	`ip4:SERVER_IP` and provider includes as needed	Use Email Deliverability in cPanel	The website IP belongs in SPF only if that server actually sends mail for the domain.
Marketing platform	Use the vendor's current include if required	Prefer aligned custom-domain DKIM	Do not add a vendor merely because it receives mail or hosts a website.