add deferred Close to smtp writer
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			@ -120,17 +120,13 @@ func (m *SendMailRequest) Execute() error {
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	if err != nil {
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		return fmt.Errorf("failed issuing DATA command (%s)", err)
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	}
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	defer smtpWriter.Close()
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	_, err = smtpWriter.Write([]byte(msg))
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	if err != nil {
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		return fmt.Errorf("failed sending mail content (%s)", err)
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	}
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	err = smtpWriter.Close()
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	if err != nil {
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		return fmt.Errorf("failed close smtp client (%s)", err)
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	}
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	return nil
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}
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