Digitally sign your emails to prove authenticity
Your Generated DKIM Records
Keep the private key secure and add the DKIM record to your DNS
You must enter the private key in your DKIM signer. It must be kept secret, as anyone with access to it can stamp tokens pretending to be you
The public key is the original raw 'X509' format. It's not usable in DNS directly, but it might be useful for something else.
Publish the generated record text on this DNS host. Format: [selector]._domainkey.[yourdomain.com] — never use @ in DNS records.
Skysnag takes the complexity out of DKIM implementation and management, ensuring your emails are properly signed and authenticated across all your sending services.
Automated Key Generation
Create strong cryptographic keys without manual intervention
Secure Key Storage
Store private keys securely while publishing public keys to DNS
Scheduled Key Rotation
Automatically rotate keys on a regular schedule for enhanced security
Multi-Service Management
Configure DKIM for all your email providers from a single dashboard
Alignment Monitoring
Ensure DKIM signatures align with your From domain for DMARC compliance
Signature Verification
Continuously test and verify that your DKIM signatures are valid
DKIM (DomainKeys Identified Mail) is an email authentication method that adds a digital signature to your emails. This signature allows receiving mail servers to verify that the message was sent from an authorized server and hasn't been tampered with during transit.
DKIM adds a digital signature to your emails that receiving servers can verify, proving the message hasn't been altered in transit.
Properly signed emails are more likely to reach the inbox instead of being filtered as spam.
Detect if email content has been modified between sending and receiving, ensuring message integrity.
Build a positive sending reputation for your domain by consistently signing emails with DKIM.
While DKIM is essential for email authentication, implementing it correctly can be challenging. Here are the common obstacles organizations face:
Generating, storing, and rotating cryptographic keys across multiple services
Configuring DKIM for each email service provider separately
Ensuring DKIM signatures align with your From domain
See the impact of proper DKIM implementation with Skysnag
99.8%
signature validation rate
15%
increase in email deliverability
100%
automated key rotation
24/7
signature monitoring
Meet with one of our experts to review your report. We'll walk you through the issues, explain the security gaps, and show you exactly how Skysnag resolves them - automatically.
Discuss my resultsSkysnag gives you everything you need to enforce DMARC, automate SPF and DKIM, deploy MTA-STS and TLS-RPT, and activate BIMI - so your emails are secure, compliant, and trusted.
Monitor
Identify email compromise attempts and troubleshoot email delivery issues
Comply
Comply with Microsoft, Google and Yahoo requirements and visualize sending data in real-time
Protect
Automate DMARC enforcement for unparalleled email security
Certify
Certify your brand with the highest identity standard globally
DKIM adds a cryptographic signature to every message you send, and a public key published in DNS lets receivers verify it was not altered. Unlike SPF, a DKIM pass survives forwarding, which makes it essential for DMARC. This generator produces the public-key TXT record (and selector) to publish for your signing key.
Use the key pair from your mail provider, or generate one — the private key stays on the signing server.
Pick a short selector; the record is published at selector._domainkey.yourdomain.com.
Add the generated v=DKIM1; k=rsa; p=… value at that host in DNS.
Turn on DKIM signing at your provider, send a test, and confirm alignment with the DKIM checker.
selector._domainkey.yourdomain.comselector._domainkey TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCB..."| Tag | What it does |
|---|---|
selector | A label (e.g. s1, google) that points to this key, published at selector._domainkey. |
v=DKIM1 | Protocol version. |
k=rsa | Key type (RSA is standard; Ed25519 also exists). |
p= | The public key itself (base64). The matching private key signs your mail at the server. |
t=y | Testing flag (optional) — tells receivers the key is in trial. |
A selector is a label that lets a domain host multiple DKIM keys. It points to the key’s record at selector._domainkey.yourdomain.com, so you can rotate keys without downtime.
DMARC passes when SPF or DKIM passes and aligns. DKIM survives forwarding where SPF breaks, so aligned DKIM is often what keeps legitimate mail passing DMARC.
Use at least 2048-bit RSA. 1024-bit is deprecated and weak; many providers now default to 2048.
Yes — rotate periodically using a new selector, publish the new key, switch signing, then retire the old record.