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Free Email marketing & deliverability Tools

SPF, DKIM, DMARC, subject lines and email metrics. 10 free tools, no sign-up.

SPF, DKIM & DMARC Checker Run one SPF, DKIM and DMARC checker on your domain to see MX, SPF, DMARC and DKIM records together, with deliverability issues clearly flagged. Live check SPF Record Checker Validate your domain's SPF TXT record with this SPF record checker, including syntax, mechanisms, the all qualifier and the 10-lookup limit. Live check DMARC Record Checker Look up and explain any domain's DMARC policy with this DMARC checker, covering policy, alignment, percentage and reporting addresses. Live check DKIM Record Checker Confirm your DKIM key is published correctly with this DKIM checker, which looks up the selector record and checks key type and revocation. Live check SPF Record Generator Build a correct SPF TXT record from the services you send email with, using this SPF record generator that counts DNS lookups as you go. In your browser DMARC Record Generator Create a valid DMARC TXT record with this DMARC record generator, plus a staged rollout plan that moves safely from monitoring to enforcement. In your browser Email Subject Line Tester Preview your subject line and preheader in desktop and mobile inboxes with this email subject line tester, and catch common problems before you send. In your browser Email Marketing Metrics Calculator Turn campaign numbers into clear rates with this email marketing metrics calculator, from delivery and opens to click-to-open, conversions and ROI. In your browser Email Marketing ROI Calculator Estimate what your list is worth each month with this email marketing ROI calculator, from clicks and orders to ROI and revenue per subscriber. In your browser MX Record Lookup List a domain's MX records in priority order, resolve each mail server's IP address and see which email provider handles the mail. Live check

About email marketing & deliverability tools

Great emails only work if they reach the inbox. Since 2024, Gmail and Yahoo expect bulk senders to have SPF, DKIM and a DMARC record, offer one-click unsubscribe and keep spam complaints under 0.3%. The checkers and generators here help with the authentication part: look up your public DNS records, spot errors and build correct SPF and DMARC records.

Once authentication is in place, use the subject line tester to preview how a campaign appears in desktop and mobile inboxes, and the metrics and ROI calculators to measure results and plan list growth. Choose the checker for problems you suspect today, and the calculators for planning and reporting.

Frequently asked questions

Do I need SPF, DKIM and DMARC?

If you send marketing or transactional email from your own domain, yes. SPF lists the servers allowed to send for you, DKIM signs each message, and DMARC tells receivers what to do when checks fail and sends you reports. Gmail and Yahoo require all three for bulk senders, and they help protect your domain from spoofing.

Why do my emails go to spam even with SPF set up?

SPF alone is not enough. Missing DKIM, no DMARC record, alignment failures, too many SPF lookups, a poor sending reputation, high complaint rates or spammy content can all hurt placement. Run the full SPF, DKIM and DMARC check first, fix any errors, then review list hygiene and content.

What is a good email open rate?

Open rates vary by industry, audience and list quality, and privacy features in some mail apps can inflate opens, so treat them with caution. Clicks, conversions and revenue per subscriber are usually more reliable. Compare each campaign with your own recent sends rather than a published average.