Set the Time for E-Mail Sending from your .NET Application

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Introduction

This is just my first trial for C#. This program will let you send e-mail at a certain time (with second). Usually normal email sending timer is with minutes. So I decided to make sending e-mail in an exact time period. I hope this project will be useful for someone.

Background

Syed Moshiur Murshed's article (Send E-Mail from your .NET Application using your GMail Account) inspired me. Also I tried his idea and tried to send the mail on time for a certain application sending. Sometimes in life, you might need to send a certain mail at a certain time. So I created this project based on Syed Moshiur Murshed's article. Thanks~!

Using the Code

The code is self explanatory by looking at the following function.

The main includes are as follows:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;
using System.Threading;
using System.Timers;
using System.Security;

Initial variables:

private string TimeStamp, CBody;
private int count;
private bool MailSent;
//Email variable
private string SMTPserver, IDstr, FromEmail, FromName, ToList, Subject, Body, Password;
private int Port;
private bool bSSL;

Taking inputs to message format:

// MessageBox mymessage;
SMTPserver = TBSMTP.Text.ToString();
IDstr =TBID.Text.ToString();
Port = int.Parse(TBPORT.Text);
Password =MBTPASS.Text.ToString();
ToList =TBTO.Text.ToString();
FromEmail= TBFROM.Text.ToString();
FromName =TBAKA.Text.ToString();
Subject =TBSUBJECT.Text.ToString();
Body = RTBBODY.Text.ToString();

Secure Sockets Layer check:

if (CBSSL.Checked)
   bSSL = true;
else
   bSSL = false;

Add Time Stamp in the bottom part of the message:

TimeStamp = "\n\n\n\nTimestamp->" + "." + TBHour.Text + 
		"." + TBMinu.Text + "." +TBSeco.Text;
Body += TimeStamp;

Sending trial which may fail in certain situations that will try again if there is a crisis.

while(count<5)
{
MailSent = sendMail(bSSL, SMTPserver, IDstr, Port, FromEmail, 
		FromName, ToList, Subject, Body, Password);
                
if (MailSent)
{
 MessageBox.Show("MAIL SENT! \n\r SUCESS!", "RESULT:",
	MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
   break;
}
 else
{
   count++;
}} if (count >0)
   MessageBox.Show("MAIL SENDING \n\r FAILED", "RESULT:",
	MessageBoxButtons.OK, MessageBoxIcon.Error);

The following is how to send mail through Gmail:

public bool sendMail(bool bSSL,string SMTPserver, string IDstr, int Port,
	string FromEmail, string FromName, string ToList, string Subject, 
	string Body, string Password)
        {
            MailMessage Msg = new MailMessage();
            //change body into html format
            Body = Body.Replace("\n", "\n<br>");
            //set message sender
            Msg.From = new MailAddress(FromEmail, FromName);
            //sets the mail recipients             
            //person(s) who will receive an email
            //(in this case 2 person will be emailed)
            Msg.To.Add(new MailAddress(ToList));
            //set to true if you want to use html in the body
            Msg.IsBodyHtml = true;
            Msg.Subject = Subject;
            //body of the email message with html tag
            Msg.Body = Body;
            //Allows applications to send e-mail
            // host server :  smtp.gmail.com
            //port number : 587
            SmtpClient objMail = new SmtpClient(SMTPserver, Port);
            //Some SMTP servers require you to authenticate first
            //gmail uses SSL      
            //info object contains the gmail
            //username, and password
            NetworkCredential info = new NetworkCredential(IDstr, Password);
            objMail.DeliveryMethod = SmtpDeliveryMethod.Network;
            objMail.Credentials = info;
            objMail.EnableSsl = bSSL;
            try
            {
                //final step send email
                objMail.Send(Msg);
                return true;
            }
            catch
            {
                return false;
            }
        }

Following is every second it checks time and sends when the time is correct.

private void timer1_Tick(object sender, EventArgs e)
{
    string m_CSec = DateTime.Now.Second.ToString();
    string m_CMin = DateTime.Now.Minute.ToString();
    string m_CHor = DateTime.Now.Hour.ToString();
    
    TBHour.Text = m_CHor;
    TBMinu.Text = m_CMin;
    TBSeco.Text = m_CSec;
    if (AlarmTog.Checked)
    {
        NUDHor.Enabled = false;
        NUDMin.Enabled = false;
        NUDSec.Enabled = false;
        if ((m_CSec == NUDSec.Value.ToString()) && 
		(m_CMin == NUDMin.Value.ToString()) && 
		(m_CHor == NUDHor.Value.ToString()))    //alarm on
        {                   
            button1_Click(sender, e);
            timer1.Stop();
        }
    }
    else
    {
        NUDHor.Enabled = true;
        NUDMin.Enabled = true;
        NUDSec.Enabled = true;
    }
    if (CBLSC.Checked)
    {
        TBSMTP.Enabled = false;
        TBID.Enabled = false;
        TBPORT.Enabled = false;
        MBTPASS.Enabled = false;
    }
    else
    {
        TBSMTP.Enabled = true;
        TBID.Enabled = true;
        TBPORT.Enabled = true;
        MBTPASS.Enabled = true;
    }
}

Form --> time check --> send is a very simple way and anyone can write this code.

Points of Interest

Even though this is not hard to do, I found that there is a good use of it. In my Outlook, I can only set hh:mm instead of hh:mm:ss. This project enables you to send out at the time you wanted it to be sent (with second!!). you can check several e-mails for yourself and check how fast it comes to your e-mail server.

I learned that there is a delay time in my e-mail server + the email process delay time in their (?) server so there is a time delay. You have to calculate this by yourself. However, the e-mail prints out a time stamp when the e-mail was sent, so you can control this bit easier.