EmailServiceApi/Services/EmailService.cs

using MimeKit;
using System;
using MailKit.Net.Smtp;
using MailKit.Security;
using MailKit;
using MailKit.Security;

using System.Net.Mail;

namespace EmailServiceApi.Services
{
    public class EmailService
    {
     

        public string SendEmailmethode1(string smtpServer, string fromAddress, string toAddress, string subject, string body,string username,string password)
        {
            try
            {
                // Create MimeMessage
                var message = new MimeMessage();
                message.From.Add(new MailboxAddress("Sender Name", fromAddress));
                message.To.Add(new MailboxAddress("Recipient Name", toAddress));
                message.Subject = subject;

                // Create body part
                var bodyPart = new TextPart("plain")
                {
                    Text = body
                };

                // Construct the multipart/mixed container to hold the message text and any attachments
                var multipart = new Multipart("mixed");
                multipart.Add(bodyPart);

                // Add the multipart/alternative part to the message
                message.Body = multipart;

                // Send email using MailKit
                using (var client = new MailKit.Net.Smtp.SmtpClient())
                {
                    client.Connect(smtpServer, 587, SecureSocketOptions.StartTls); // Assuming SMTP server is using port 587 for TLS encryption
                    client.Authenticate(username, password); // Provide credentials here if required by your SMTP server
                    client.Send(message);
                    client.Disconnect(true);
                }

                return "Email sent successfully.";
            }
            catch (Exception ex)
            {
                string errorMessage = "Failed to send email(methode 1): " + ex.Message;

                // Check if inner exception exists and its message is not null
                if (ex.InnerException != null && !string.IsNullOrEmpty(ex.InnerException.Message))
                {
                    errorMessage += "\n Details: " + ex.InnerException.Message;
                }

                throw new Exception(errorMessage);
            }
        }
        public string SendEmailMethode2(string smtpServer, string fromAddress, string toAddress, string subject, string body, int? times = 1)
        {
            try
            {
                MailMessage oEmail = new MailMessage(fromAddress, toAddress, subject, body);
                var emailClient2 = new System.Net.Mail.SmtpClient(smtpServer);

                for (int i = 0; i < times; i++)
                {
                    oEmail.Subject = subject + " (" + i + ")";
                    emailClient2.Send(oEmail); //Send email
                }

                return "Email sent successfully.";
            }
            catch (Exception ex)
            {
                string errorMessage = "Failed to send email(methode 2): " + ex.Message;

                // Check if inner exception exists and its message is not null
                if (ex.InnerException != null && !string.IsNullOrEmpty(ex.InnerException.Message))
                {
                    errorMessage += "\n Details: " + ex.InnerException.Message;
                }

                throw new Exception(errorMessage);
                // return $"Failed to send email: {ex.Message}";
            }
        }



    }
}