Free email & deliverability tools
38 quick, free checks, calculators and generators for email, phone and deliverability — verify addresses, generate SPF/DKIM/DMARC records, scan reputation, score a list, calculate open rate, ROI and bounce risk. No signup needed. When you're ready to clean a whole list, upload it to BounceBlock and preview the first 100 rows free.
Scan a domain's MX, SPF, DMARC and DKIM in one go — no login.
Check whether a single email address is valid and deliverable.
Check a phone number's format, line type and likely status.
Catch typos and malformed addresses instantly, in your browser.
See whether an address uses a throwaway / temporary domain.
See the mail servers a domain uses to receive email.
Lint your SPF record for common mistakes.
Check your DMARC policy for syntax and strength.
Validate the shape of a DKIM TXT record.
Score a subject line for spam-trigger risk.
Work out your bounce rate and whether it's safe.
Build a valid SPF record from the services you send with.
Format a DKIM public key into a valid DNS TXT record.
Generate a DMARC policy with the right enforcement and reporting.
Check whether a domain or IP is on common email blacklists.
Check a sending IP's reverse DNS and blacklist status.
See whether a domain accepts mail for any address.
Spot role-based addresses like info@ and sales@ instantly.
Validate the carrier and line type of a number on your list.
Check whether a number on your list is live and reachable.
Generate the likely work-email formats at a company.
Break down an address's deliverability signals — not the person.
Find the likely website domain for a company name.
Paste a list to dedupe and remove invalid, role and disposable addresses.
Work out your open rate and how it compares to benchmarks.
Measure net list growth and project it forward.
Calculate the return on an email campaign or program.
Check your complaint rate against the 0.3% provider limit.
Estimate the revenue free & disposable signups cost you.
See what cleaning your list saves before you send.
Predict a list's bounce rate before you hit send.
Score a pasted list for duplicates, role and disposable addresses.
Check a domain's mail servers and where they point.
Estimate your inbox-placement odds from your setup.
Plan a sending ramp from your current to target volume.
Convert CIDR notation to an IP range, and back.
Get recommended send windows for your audience.
Grade a sending domain on authentication and blacklists.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.