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Hi ahirschp785,

here are some errors that i have found in your code:

- The square brackets in the line "MailSubject = fn("Mail.Subject"];"" seem to be incorrectly placed. The corrected line should be "MailSubject = fn("Mail.Subject");".

- The characters "｝；" at the end of the SmtpClient initialization block appear to be incorrect syntax. The correct syntax should be "};".

- The lambda expression "x →>" is not valid. It should be replaced with "x =>" for proper syntax.

MailSubject = fn("Mail.Subject");
MailSMTP = fn("Mail.SMTP");
MailPort = fnNumber("Mail.SMTP.Port");

public void Send(string subject, string body, string mailTo, Dictionary<string, byte[]> attachments)
{
    var fromAddress = new MailAddress(MailOrigin, MailMask);
    var toAddress = new MailAddress(mailTo, mailTo);
    
    var smtp = new SmtpClient
    {
        EnableSsl = true,
        UseDefaultCredentials = false,
        Credentials = new NetworkCredential(fromAddress.Address, MailPassword),
        Host = MailSMTP,
        Port = MailPort,
        DeliveryMethod = SmtpDeliveryMethod.Network
    };

    using (var message = new MailMessage(fromAddress, toAddress)
    {
        Subject = subject,
        Body = body
    })
    {
        if (attachments != null && attachments.Count > 0)
        {
            attachments.ToList().ForEach(x =>
            {
                message.Attachments.Add(new Attachment(new MemoryStream(x.Value), x.Key));
            });
        }

        smtp.Send(message);
    }
}

Enter the inputs in the start of your script and try to run it.