DKIM verification and canonicalization of leading double dots

Just wondering how can I properly verify my DKIM signature? Especially using popular service like Gmail, Yahoo Mail or Hotmail (if it supports DKIM)?

Also, when transfer email as quoted printable in SMTP, the leading dot is converted to two, would this be considered as one or two dots when calculate the body hash?开发者_Python百科 I get this one from the specification, in [RFC 4871], page 25, it stated, that the dot-stuffing should only be consider as one dot.

Many thanks.

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Maybe this will help? http://www.mydigitallife.info/2007/08/08/how-to-check-test-and-validate-spf-record-in-dns-is-correct-and-valid/