add deferred Close to connection
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			@ -91,6 +91,7 @@ func (m *SendMailRequest) Execute() error {
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	if err != nil {
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		return fmt.Errorf("failed initiating smtp connection (%s)", err)
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	}
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	defer conn.Close()
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	smtpClient, err := smtp.NewClient(conn, smtpServerHost)
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	if err != nil {
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