What EmailSheriff does.
The six tools, the free tier, and where to begin - in two minutes.
EmailSheriff is a free toolkit for checking and fixing email deliverability - the set of things that decide whether your email lands in the inbox or the spam folder. This guide is the 2-minute orientation: what the tools do, what's free, and where to start.
The six tools
Each tool answers one deliverability question, and you can use every one without an account:
- CRM DNS VerifierChecks your SPF, DKIM, and DMARC against your CRM's exact spec - HubSpot, Salesforce, Mailchimp, Zoho, Pipedrive, ActiveCampaign and more. This is the place most people start. Open it →
- DNS CheckerA plain-English read of your SPF, DKIM, DMARC, and MX records, including a counter for the 10-lookup SPF limit. Open it →
- List CleanerUpload or paste an email list and strip out invalid, duplicate, disposable, and role-based addresses before you send. Open it →
- Blacklist SweepChecks whether your domain or IP is listed on the major real-time blocklists (RBLs). Open it →
- Header ForensicsPaste a raw email header and see the full delivery path and authentication results, decoded. Open it →
- Spam ScoreScores your message content against common spam-filter triggers before you hit send. Open it →
Want everything at once? The Full Audit runs all the core checks on a domain in about 30 seconds and grades it A-F.
What's free
A lot. Single-email and single-domain checks are unlimited with no signup. As a guest you can check up to 500 emails per file and 500 a day. Create a free account and list cleaning jumps to 50,000 emails/month plus 25 mailbox checks/month. See Understand your limits & credits for the full breakdown.
Privacy by design. When you check other people's email addresses, we hash them before they ever touch our database - we never store third-party addresses in plain text. Here's how that works.
Where to start
If you're not sure why your email is going to spam, run a Full Audit first - it points you at the specific problem. If you already know it's a DNS/authentication issue with a particular CRM, jump straight to the CRM DNS Verifier.