Почему OpenDKIM подписывает письмо дважды?

Question

[toropchin]

У меня ubuntu server 12.04 с почтовиком iRedMail.
Настроил Postfix+Opendkim по этой статье habrahabr.ru/post/151904
В результате письмо подписывается два раза. И из-за этого не проходит проверку. Из-за чего такое может быть?

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X-Spam-Report: *  1.6 SUBJ_ALL_CAPS Subject is all capitals
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