Explain what to do with the missing DKIM public key
You need to add the following line to your DNS zone : mail._domainkey.abcdomain.com 86400 IN TXT "v=DKIM1; h=sha256; k=rsa; p=the-public-key-base64"
The customer don't know what to do and where to get their public key.
The DKIM public key is generated on the host mailserver and must be given to the customer.
Please add a message like this: "Please ask your public key from the mail server administrator.".
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