1. If you have setup a DNS TXT record for DKIM (as shown on the MAIL SIGNING "CERTIFICATE" tab) for that domain then it should test fine. Depending on what you are using for DNS you may have to encapsulate your Key if it is 2048-bits or higher. You can encapsulate a DNS TXT record as follows for BIND DNS (used by most DNS providers):

 

Name	Type	Data
exa._domainKey.example.com	TXT	( "k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7eUgxJr9AIAVJ86tjc3c" "N2ZKygm0LGZTlOpbrpMHX+888MTB+GeHRkWPJ6UNHz4xioTK4rLodGE4zJoEeFklC7ajoUZ" "HMJcYr/5Ge82JlW6zrDIgUdCDRNDcgLENP5n+VSY7D8nByOt9eySaH/q4MPzVdHFoGI6fFZ+" "BJ2XGE8Ng6J9A2aHFrhvahqr0GcZI6SHQdN1vxRvZaC5EIHSWKFtk3f2naD2NoPMOB7BZB2" "WQ+m/PSLjB71YlLXF6jVJeuzeId5sOZqhkiX7oFXnJltFrP8JRHifC6Bv6M4+aP95VPBpYiEDZJ" "TqPTjx2X2e1CMemPqlAg5J1EiXAoVwx4QIDAQAB" )

 
Nest the entire Public Key in parentheses and then for each line nest it in double-quotes. Each line should not exceed 250 characters. If done correctly, and DNS has propagated, the DNS check should succeed.

(With Microsoft DNS you don't have to encapsulate the Public Key with parentheses and double-quotes, but you still have to break the key into multiple lines less than 250 characters each.)

2. It sounds like you generated the Public Key and Tested DNS but did you remember to click on the [SAVE] button on the MAIL SIGNING screen for that domain? Any changes you make are transitory and not committed until you click on [SAVE].

Thank you for your response!

 

If I encaptulate the key as suggested, I still can't get the DNS to test ok. If I then send an email from the admin user in SmarterMail, the received email header record shows:

X-SmarterMail-Spam: ISpamAssassin 0 [raw: 0], SPF_Pass, DK_None, DKIM_TempFail, RHSBL.

 

If I don't encaptulate the public key in DNS then email header record shows:

X-SmarterMail-Spam: ISpamAssassin 0 [raw: 0], SPF_Pass, DK_None, DKIM_Pass, RHSBL

Although this looks OK the DNS Test Fails.

 

The Key is generated and saved carefully. But, if I do the above test sending an email from a client (Outlook) that uses the SmarterMail SMTP then NO Signing at all of the email appear in the email header!

 

Any suggestions please?