Free Email Infrastructure & Deliverability Tools
Free, browser-based utilities to help developers, sysadmins, and founders configure DNS authentication records and calculate infrastructure savings.
2048-bit DKIM Key & Record Generator
Generate cryptographically secure 2048-bit RSA DKIM key pairs and formatted DNS TXT records directly in your browser. Meets Google and Yahoo 2026 bulk sender requirements.
DMARC Record Generator & Validator
Generate an RFC 7489-compliant DMARC TXT record for your domain with p=reject, rua reporting, and Google/Yahoo 2026 bulk sender compliance.
SPF Record Generator & 10-Lookup Checker
Construct valid SPF records for Amazon SES, SendGrid, Mailgun, and Google Workspace while monitoring the strict RFC 7208 10-DNS-lookup limit.
Transactional Email Cost Calculator
Calculate your exact cost savings across SendGrid, Mailgun, Postmark, and Amazon SES compared to CentricSell Mail's zero per-email fee model.
Ready to scale your transactional & bulk email?
Get started with CentricSell Mail in minutes. Bring your existing AWS SES, SendGrid, or Mailgun credentials, or deploy onto your own dedicated VPS with verified SPF, DKIM, and rDNS.