CourseWork/University/UniversityBusinessLogic/MailWorker/MailKitWorker.cs

using Microsoft.Extensions.Logging;
using UniversityContracts.BindingModels;
using UniversityContracts.BusinessLogicsContracts;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Net;
using System.Security.Authentication;
using System.Text;
using System.Threading.Tasks;
using MailKit.Net.Pop3;
using MailKit.Security;
using System.Net.Mime;

namespace UniversityBusinessLogic.MailWorker
{
    public class MailKitWorker : AbstractMailWorker
    {
        public MailKitWorker(ILogger<MailKitWorker> logger) : base(logger) { }

        protected override async Task SendMailAsync(MailSendInfoBindingModel info)
        {
            using var objMailMessage = new MailMessage();
            using var objSmtpClient = new SmtpClient(_smtpClientHost, _smtpClientPort);

            try
            {
                objMailMessage.From = new MailAddress(_mailLogin);
                objMailMessage.To.Add(new MailAddress(info.MailAddress));
                objMailMessage.Subject = info.Subject;
                objMailMessage.Body = info.Text;
                objMailMessage.SubjectEncoding = Encoding.UTF8;
                objMailMessage.BodyEncoding = Encoding.UTF8;
                Attachment attachment = new Attachment("C:\\ВременныеОтчёты\\Сведения по планам обучения.pdf", new ContentType(MediaTypeNames.Application.Pdf));
                objMailMessage.Attachments.Add(attachment);

                objSmtpClient.UseDefaultCredentials = false;
                objSmtpClient.EnableSsl = true;
                objSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                objSmtpClient.Credentials = new NetworkCredential(_mailLogin, _mailPassword);

                await Task.Run(() => objSmtpClient.Send(objMailMessage));
            }
            catch (Exception)
            {
                throw;
            }
        }

    }
}