Code for sending an email with attachment via gmail

SendViaGmail.cs

using System.IO;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;

namespace SendViaGmail
{
    class Program
    {
        static void SendEmail(SmtpClient smtp, MailAddress from, MailAddress to, string subject, string body, string attachmentPath)
        {
            using (var message = new MailMessage(from, to) { Subject = subject, Body = body })
            {
                if (attachmentPath != null && File.Exists(attachmentPath))
                {
                    var attachment = new Attachment(attachmentPath, MediaTypeNames.Application.Octet);
                    var disposition = attachment.ContentDisposition;
                    disposition.CreationDate = File.GetCreationTime(attachmentPath);
                    disposition.ModificationDate = File.GetLastWriteTime(attachmentPath);
                    disposition.ReadDate = File.GetLastAccessTime(attachmentPath);
                    disposition.FileName = Path.GetFileName(attachmentPath);
                    disposition.Size = new FileInfo(attachmentPath).Length;
                    disposition.DispositionType = DispositionTypeNames.Attachment;
                    message.Attachments.Add(attachment);
                }

                smtp.Send(message);
            }
        }

        static void Main(string[] args)
        {
            var from = new MailAddress("your.gmail.account@gmail.com", "From MailAddress");
            var destinations = new MailAddress[]
            {
                new MailAddress("to0@theirdomain", "To0 MailAddress"),
                new MailAddress("to1@theirdomain", "To1 MailAddress")
            };

            const string password = "<YOUR GMAIL APP PASSWORD>";
            const string subject = "Test Subject";
            const string body = "Test Body";
            const string attachmentPath = @"d:\test.pdf";

            using (var smtp = new SmtpClient
            {
                Host = "smtp.gmail.com",
                Port = 587,
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential(from.Address, password)
            })
            {
                foreach (var destination in destinations)
                {
                    SendEmail(smtp, from, destination, subject, body, attachmentPath);
                }
            }
        }
    }
}