Leere E-Mail in Googlemail (PHP / HTML E-Mail)

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Ja, da ist dein HTML Text und wo ist dein Alternativtext?

// Plaintext
--23fda98fd63d5dec1df6c2a2d859c464
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit

This is a message in multipart MIME format. Your mail client should not be displaying this. Consider upgrading your mail client to view this message correctly.

// HTML
--23fda98fd63d5dec1df6c2a2d859c464
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: 8bit