| DESCRIPTION | 
| Purpose | A dkim_param_t is a value from an enumerated list of the possible
    signature parameters (tags) available. |  
| Possible Values | 
 DKIM_PARAM_UNKNOWN -- tags not known by the API
 DKIM_PARAM_SIGNATURE -- base64-encode signature data
 DKIM_PARAM_SIGNALG -- DKIM signing algorithm
 DKIM_PARAM_DOMAIN -- signing domain
 DKIM_PARAM_CANONALG -- canonicalization algorithm(s)
 DKIM_PARAM_QUERYMETHOD -- key lookup method
 DKIM_PARAM_SELECTOR -- selector
 DKIM_PARAM_HDRLIST -- colon-separated header list
 DKIM_PARAM_VERSION -- version
 DKIM_PARAM_IDENTITY -- sender's identity
 DKIM_PARAM_TIMESTAMP -- signature timestamp
 DKIM_PARAM_EXPIRATION -- signature expiration
 DKIM_PARAM_COPIEDHDRS -- copied headers
 DKIM_PARAM_BODYHASH -- body hash
 DKIM_PARAM_BODYLENGTH -- body length
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