WorkFlowCheck/src/WorkFlowCheck.BL/Services/MessageService.cs

using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using Microsoft.Extensions.Configuration;
using WorkFlowCheck.BL.Models;
using WorkFlowCheck.BL.Services.Interfaces;

namespace WorkFlowCheck.BL.Services
{
    public class MessageService : IMessageService
    {
        private readonly EmailSettings _settings;

        public MessageService(IConfiguration configuration)
        {
            _settings = configuration.GetSection("EmailSettings").Get<EmailSettings>()!;
        }

        public async Task<bool> SendMailAsync(List<string> recipients, string subject, string htmlBody)
        {
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(_settings.SenderName, _settings.Username));

            foreach (var recipient in recipients)
            {
                message.To.Add(MailboxAddress.Parse(recipient));
            }

            message.Subject = subject;

            message.Body = new TextPart("html")
            {
                Text = htmlBody
            };

            using var smtp = new SmtpClient();
            await smtp.ConnectAsync(_settings.SmtpServer, _settings.SmtpPort, SecureSocketOptions.StartTls);
            await smtp.AuthenticateAsync(_settings.Username, _settings.Password);
            await smtp.SendAsync(message);
            await smtp.DisconnectAsync(true);

            return true;
        }
    }

}