Signature reconginized issue

I had an email come like the following

Quidem est perspiciatis omnis voluptatibus consequatur est et. Impedit occaecati quas voluptatem voluptas dolor eum consequatur.

Assumenda voluptatem tempore dignissimos. Id omnis nisi--ratione omnis qui suscipit.
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Name

Since there is a new line and then a '--' embedded in the sentence, the emails were getting cut short.

先使用 issue 中顯示的電子郵件文字重現 parser 的行為，然後追蹤簽名偵測處理換行字元和嵌入的 "--" 的位置。在此情況下電子郵件內容不再被截短即表示完成；issue 中沒有指出具體的檔案或測試。

由索引模型根據 Issue 內容生成。