Sidemail tools
Free tools for email setup, delivery improvement, and list hygiene.
Email validation
Check email addresses before sending product updates, newsletters, or any bulk campaigns to avoid bounces.
Email Validator
Validate one email address for syntax, MX, disposable domains, typos, and SMTP reachability.
Open Email ValidatorEmail List Validation
Run the same validation checks against a full list before importing contacts or sending campaigns.
Open Email List ValidationEmail List Cleaner
Clean invalid, risky, disposable, and duplicate email addresses from your email list.
Open Email List CleanerDomain authentication
Check or generate the DNS records that protect deliverability.
DKIM Checker
Look up a DKIM selector and inspect the live key record.
Open DKIM CheckerDKIM Generator
Generate DKIM DNS records and keys in the browser.
Open DKIM GeneratorSPF Checker
Verify SPF policy, includes, redirects, and DNS lookup count.
Open SPF CheckerSPF Generator
Build a copy-ready SPF TXT record for your sending services.
Open SPF GeneratorDMARC Checker
Validate DMARC policy, alignment, report settings, and syntax.
Open DMARC CheckerDMARC Generator
Create a DMARC TXT record with policy, alignment, and reports.
Open DMARC GeneratorDelivery diagnostics
Understand SMTP bounces before retrying, suppressing a recipient, or changing sender setup.
SaaS calculators
Useful founder math without opening a spreadsheet.
Need to deliver emails?
Sidemail helps SaaS and AI teams reliably send emails, manage, monitor, and improve email delivery from one simple platform. Create your account now and start sending your emails in under 30 minutes.
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