How to Set Up DKIM for Zoho Mail

Generate and publish a DKIM key in Zoho Mail admin to enable cryptographic signing of outgoing email.

Quick Answer — The Record You Need

Record Type

TXT

Host / Name

zmail._domainkey

Value

v=DKIM1; k=rsa; p=YOUR_PUBLIC_KEY_FROM_ZOHO

The default selector is "zmail" but you can customize it. Generate the key in Zoho Mail admin.

Step-by-Step Setup

Log in to Zoho Mail Admin

Go to the Zoho Mail admin console for your domain.

Navigate to DKIM settings

Go to Domains > your domain > Email Authentication > DKIM.

Generate a DKIM key

Click "Add" to create a new DKIM key. You can customize the selector name (default is often "zmail") and choose the key size (2048-bit recommended).

Add the TXT record to DNS

Copy the generated TXT record and add it to your DNS.

zmail._domainkey.yourdomain.com  TXT  "v=DKIM1; k=rsa; p=MIIBIjANBgkq..."

Verify and activate in Zoho

Click "Verify" in Zoho Mail admin. Once verified, Zoho will begin signing outgoing email with DKIM.

Common Gotchas

You must verify and activate DKIM in Zoho after adding the DNS record. It does not activate automatically.
Zoho allows custom selectors. The commonly used default is "zmail" but confirm what your account shows.
If your DNS provider has a character limit on TXT records, use 1024-bit keys instead of 2048-bit.

Verify Your Setup

After adding your DNS records, use our free DKIM checker to verify everything is configured correctly. DNS changes typically propagate within minutes, but can take up to 48 hours.

Frequently Asked Questions

What DKIM selector does Zoho Mail use?

Zoho Mail commonly uses "zmail" as the default selector, but you can customize it during DKIM key generation.

Does Zoho Mail support 2048-bit DKIM keys?

Yes. Zoho recommends 2048-bit keys for stronger security. Use 1024-bit only if your DNS provider has character limits.

Can I have multiple DKIM keys in Zoho Mail?

Yes. Zoho Mail allows multiple DKIM selectors per domain, which is useful for key rotation.