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DKIM keys and TXT record limits

Protect against spoofing & phishing, and help prevent messages from being marked as spam

Most TXT records can have up to 255 characters. For TXT records that include more than 255 characters, DNS adds multiple strings together in a single record.

If you’re using a 2048-bit DKIM key, you can’t enter it as a single text string in a DNS record with a 255-character limit. Instead, take these steps:

  1. Split the key characters into multiple text strings.
  2. Put each string inside quotes.
  3. Enter the strings one after another in the TXT record Value field at your domain provider.

In this example, a long DKIM key is split into two text strings, and each string is inside quotes:

"k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/"

"w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5c/zMthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YW7WosL45CSkyp4QeQIDAQAB"

You can also try:

We recommend adding no more than 49 TXT records at your domain provider because this is the maximum number supported by most domain providers. 

Related Topics

About TXT records

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