Fix DKIM's error when there is S/MIME-sign #2340
Open
+8
−1
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In $parts[0] there is MIME-Version and Content-Type delimited by "\n".
Need to separate them, otherwise error with DKIM: "dkim=neutral (body hash did not verify)" (The reason is in "h=Date:To:From:Reply-To:Subject:Message-ID:X-Mailer;" without MIME-Version and Content-Type)
Test environment : PHP 8.0.6, PHPmail, isSMTP, DKIM-sign, S/MIME