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After any successful file export from the Data Fusion Arena — whether the output is JSON, TXT, XML, XLSX, or CSV — the application offers to send the file by email. This opens FormCorreoEnvio, which uses MailKit and MimeKit to connect to an SMTP server, authenticate, attach the exported file, and deliver the message asynchronously without blocking the UI.

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How It Works

  1. After a successful export, FormDataBase calls OfrecerEnviarPorCorreo(rutaArchivo) with the path returned by the SaveFileDialog.
  2. A MessageBox.Show prompt asks the user whether to send the file, displaying the filename in the message text.
  3. If the user clicks Yes, new FormCorreoEnvio(rutaArchivo).ShowDialog() opens the send dialog with the attachment path already set.
  4. The dialog pre-fills the Subject field as "Archivo exportado: {filename}" and provides a default message body. The user only needs to enter the recipient address.
  5. On clicking Send, MailKit’s SmtpClient connects to the configured SMTP host using SecureSocketOptions.StartTls, authenticates with the sender credentials, attaches the file via BodyBuilder.Attachments.Add(path), and sends the message asynchronously with await smtp.SendAsync(msg).
  6. A success dialog confirms the recipient address. If authentication fails, a specific error message is shown distinguishing credential errors from general network failures.

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EmailSettings

Sender preferences are persisted between sessions using a lightweight JSON file stored in Application.UserAppDataPath. The EmailSettings class provides two static methods to read and write the saved sender address. 
// Persisted settings model (stored as email_settings.json)
internal static class EmailSettings
{
    // Returns the saved sender address, or an empty string if none is stored
    public static string CargarRemitente()

    // Saves the sender address for future sessions
    public static void GuardarRemitente(string correo)
}
The settings file is located at: 
%APPDATA%\ExploradorDeArchivos\{version}\email_settings.json
The JSON structure is minimal: 
{
  "Remitente": "you@example.com"
}

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Common SMTP Settings

The current implementation connects to Gmail on port 587 with STARTTLS. To target a different provider, update the SmtpHost, SmtpPort, and sender credential constants in FormCorreoEnvio.cs.
ProviderHostPortSecurity
Gmailsmtp.gmail.com587TLS
Outlook / Hotmailsmtp.office365.com587TLS
Yahoosmtp.mail.yahoo.com465SSL
Gmail requires an App Password if two-factor authentication is enabled on the sender account. Standard account passwords are rejected with an AuthenticationException. Generate an App Password at https://myaccount.google.com/apppasswords and use it in place of your regular password.
The file attached to the email is read from the exact path returned by the SaveFileDialog during export. If the file is moved, renamed, or deleted before the send dialog is submitted, the Validar() method will detect the missing file with File.Exists(_archivoAdjunto) and show an error — no email will be sent.

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