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Can I have multiple txt DKIM entries in the same domain?

I have several cloud applications that send Mails for contacts. Each application has a DKIM setting.

For example: cloud app 1 : k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB cloud app 2 : k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB

I have to add both text records to my DNS records. I am sure I can add it 2 txt records. Do I need to combine both txt entries.

Please suggest me a way to add multiple TXT records in the same domain.

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4 answers

Yes, you can. The DKIM signature is as follows:

 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=M1X/nttSCpN...ttSCpN=; b=SPso8U12ChySEQcnJcvm76...RAxjJFcBI=

During validation, the selector and domain (selector1 and example.com above, respectively) are used to determine the TXT record using the public key. This is done by merging them with _domainkey between:

 selector1._domainkey.example.com

In your case, you can use 2 different selectors (for example, cloudapp1 and cloudapp2), then each private key can have its own unique DNS record. The corresponding DNS records look something like this:

 cloudapp1._domainkey 3600 IN TXT "v=DKIM1; k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB" cloudapp2._domainkey 3600 IN TXT "v=DKIM1; k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB" = rsa; t = s; p = MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N + Il220oK2Cp + NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6 + / 7UVXf9xOeupr1DqtNwKt / NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB" cloudapp1._domainkey 3600 IN TXT "v=DKIM1; k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB" cloudapp2._domainkey 3600 IN TXT "v=DKIM1; k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfl0chtL4siFYCrSPxw43fqc4zOo3N+Il220oK2Cp+NZw9Kuvg8iu2Ua3zfbUnZWvWK4aEeooliRd7SXIhKpXkgkwnAB3DGAQ6+/7UVXf9xOeupr1DqtNwKt/NngC7ZIZyNRPx1HWKleP13UXCD8macUEbbcBhthrnETKoCg8wOwIDAQAB"
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Yes you can, but you must keep them separated using selectors, read the following link for more information https://help.dreamhost.com/hc/en-us/articles/215029758

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Yes, you can have multiple DKIM records, with type TXT or CNAME, in the same domain. This is necessary for DKIM key rotation, which periodically changes the private key of a key pair.

When you create multiple DKIM records, you need to select a selector that is unique to all DKIM records in this domain. Thus, using a DKIM record does not interfere with another.

Refer to this post for more information: https://dmarcly.com/blog/what-is-dkim-selector-and-how-does-it-work-dkim-selector-explained

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Since I can’t comment yet ...

The link in the Pradeep answer is dead. This is now: https://help.dreamhost.com/hc/en-us/articles/215029758 .

I found it by going to https://help.dreamhost.com and doing a search for "DKIM".

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