Free DKIM Record & Selector Syntax Generator
Generate correct DKIM DNS resource record templates with selector naming conventions for Postfix, Exim, Google Workspace, and Microsoft 365.
DNS Entry Parameters:
• Type: TXT
• Host / Name: google._domainkey.yourdomain.com
• Value: Replace the example public key with the private/public keypair generated by your mail server or Postfix relay.
Why Cold Outbound Teams Use Our Free DKIM Generator
Custom selector naming generator
RSA public key formatting
DNS TXT chunking support (>255 characters)
Email Deliverability Standards (US & UK Outbound Guidelines)
In February 2024, Google Workspace and Yahoo introduced strict anti-spam enforcement rules that mandate proper SPF, DKIM, and DMARC authentication for all outbound mailboxes. If your DNS records have syntax errors or exceed the 10-lookup threshold, incoming mail servers will silently route your cold outreach into the Spam folder or reject connections entirely.
Requires valid physical postal address in signatures, accurate From header identification, and clear opt-out mechanics.
Permits B2B outreach under legitimate interest when targeted to relevant corporate decision-makers with authenticated sender identity.
Frequently Asked Questions About DKIM Generator
Why do 2048-bit DKIM records sometimes fail DNS validation?
A 2048-bit key generates a string longer than 255 characters. In standard DNS, you must split long TXT records into multiple double-quoted strings or use a DNS provider that handles automatic chunking (like Cloudflare).
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