Luis Daniel,

> Is there a service that a user may post complete mail and you can know if
> that DKIM signature is valid or not?

Not that I would know.


I usually test signatures of a message from a commad line, e.g.:

perl -MMail::DKIM::Verifier -ne '
 BEGIN{$dkim=Mail::DKIM::Verifier->new_object};
 s/\r?\n\z/\015\012/;$dkim->PRINT($_);
 END{$dkim->CLOSE;print $dkim->result_detail,"\n"}' test.msg

Make sure you have a fairly recent version of Mail::DKIM
(0.31 is fine).

Note that some mail readers (such as kmail) gratuitously
reformats some of the header fields, so saving a received
message to a file from MUA and checking it may fail
even though the message as seen by MTA/filter/LDA was fine.

It is best to pick a received message directly from a
mailbox file.

  Mark

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