| DESCRIPTION | 
| Purpose | A dkim_alg_t is a value from an enumerated list of the possible
    message signing algorithms available.  It is passed as a parameter to
    dkim_sign() when selecting a signing
    algorithm to be used to sign a message.  It need not be passed to
    dkim_verify() as that function
    will determine the signing algorithm for verification based on the
    signature on an arriving message. |  
| Possible Values | 
 DKIM_SIGN_RSASHA1 -- use an RSA-signed SHA1 hash of the message's
     headers and body
 DKIM_SIGN_RSASHA256 -- use an RSA-signed SHA256 hash of the
     message's headers and body
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