Add a DKIM signature
You can add DKIM signatures to the headers of outbound emails by specifying the domain, a selector, and a private RSA key. A domain can have more than one signature.
To add a DKIM signature, do as follows:
- Go to Email > General settings. Scroll down to DKIM signing and click Add.
- For Domain, enter the FQDN of the domain.
Enter the key selector.
You can use the location or name of a specific mail server to identify outbound mails from the server, for example,
Enter the private RSA key.
You can generate the key, using a key generator, such as PuttyGen or Windows OpenSSL. A private key can have 1024 to 2048 bits. Don’t use RSA SHA-1.
Update the TXT record for the DKIM signature on the DNS server. Once the DNS changes propagate, the DKIM signature will take effect.