Code Duplication    Length = 4-5 lines in 3 locations

src/Archangel.php 3 locations

@@ 280-283 (lines=4) @@
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            $messageString .= "--{$this->getBoundary()}" . self::LINE_BREAK;
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        }
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        if (!empty($this->plainMessage) && !empty($this->htmlMessage)) {
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            if (!empty($this->attachments)) {
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                $messageString .= "Content-Type: multipart/alternative; boundary={$this->getAlternativeBoundary()}" . self::LINE_BREAK;
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                $messageString .= self::LINE_BREAK;
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            }
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            $messageString .= "--{$this->getAlternativeBoundary()}" . self::LINE_BREAK;
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            $messageString .= 'Content-Type: text/plain; charset="iso-8859"' . self::LINE_BREAK;
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            $messageString .= 'Content-Transfer-Encoding: 7bit' . self::LINE_BREAK;
@@ 299-303 (lines=5) @@
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            $messageString .= "--{$this->getAlternativeBoundary()}--" . self::LINE_BREAK;
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            $messageString .= self::LINE_BREAK;
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        } else if (!empty($this->plainMessage)) {
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            if (!empty($this->attachments)) {
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                $messageString .= 'Content-Type: text/plain; charset="iso-8859"' . self::LINE_BREAK;
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                $messageString .= 'Content-Transfer-Encoding: 7bit' . self::LINE_BREAK;
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                $messageString .= self::LINE_BREAK;
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            }
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            $messageString .= $this->plainMessage;
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            $messageString .= self::LINE_BREAK;
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        } else if (!empty($this->htmlMessage)) {
@@ 307-311 (lines=5) @@
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            $messageString .= $this->plainMessage;
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            $messageString .= self::LINE_BREAK;
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        } else if (!empty($this->htmlMessage)) {
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            if (!empty($this->attachments)) {
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                $messageString .= 'Content-Type: text/html; charset="iso-8859-1"' . self::LINE_BREAK;
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                $messageString .= 'Content-Transfer-Encoding: 7bit' . self::LINE_BREAK;
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                $messageString .= self::LINE_BREAK;
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            }
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            $messageString .= $this->htmlMessage;
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            $messageString .= self::LINE_BREAK;
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        }