Develop Reference

How to send mails to multiple reciepients from web application?

I have developed a asp.net Mvc 4 project and now i am planing to integrate a Mail system in my application.Initially i taught like integrating mail System in my existing web application but later i moved it to a console application using Scheduler to send mail at some time interval.
My scenario is like i have a list of mail ids and i need to send mail to all these mail ids . I have checked System.Web.Mail and i found i can only give one email address at a time. Is it possible in System.Web.Mail or is there any other library available to achieve my scenario.

To in System.Net.Mail is a MailAddressCollection,so you can add how many addresses you need.
MailMessage msg = new MailMessage();
msg.To.Add(...);
msg.To.Add(...);

Chris's answer is correct but you may want to also consider using a mail service. Here are some you could try - they all have a free tier to get started on.
http://sendgrid.com/
http://www.mailgun.com/
https://mandrill.com/
http://aws.amazon.com/ses/

You can easily sent emails to more than one recipient. Here is a sample that uses a SMTP server to send an email to multiple addreses:
//using System.Net.Mail;
public void SendEmail(){
MailMessage email = new MailMessage();
email.To.Add("first#email.com");
email.To.Add("second#email.com");
email.To.Add("third#email.com");
email.From = new MailAddress("me#email.com");
string smtpHost = "your.SMTP.host";
int smtpPort = 25;
using(SmtpClient mailClient = new SmtpClient(smtpHost, smtpPort)){
mailClient.Send(email);
}
}
Just a note: if you go with SMTP, you should probably have a look also on MSDN for the SmtpClient.Send method, just to be sure you are catching any related exceptions.

Using Mail.dll with Microsoft Exchange Imap version 4

I am using mail.dll for reading emails. Earlier I was reading the emails from a gmail account and every thing was working alright. Now I need to move the application to another server and read mail from microsoft exchange.Below is the code that I am using
using (Imap imap = new Imap())
{
imap.Connect("server-name", port number);
imap.Login("username", "password");
imap.SelectInbox();
List<long> uids = imap.Search(Flag.Seen);
if (uids.Count > 0)
{
string eml = imap.GetMessageByUID(uids[0]);
IMail email = new MailBuilder().CreateFromEml(eml);
imap.GetMessageByUID(uids[0]);
lbResponse.Text = email.Subject;
}
else
{
lbResponse.Text = "No mails found";
}
imap.Close();
}
I have verified the port and server by using telnet and it is correct. But I get the "Unable to read data from the transport connection. A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond " error. Please help.

Make sure that IMAP is enabled on your Exchange server:
http://technet.microsoft.com/en-us/library/bb124489.aspx
Also consider using:
imap.Search(Flag.Seen)
SearchFlag is obsolete in the latest version: http://www.limilabs.com/mail

Is it possible to send an email programmatically without using any actual email account

I'm thinking of implementing "Report a bug/Suggestions" option to my game, however I am not quite sure how I could get that working. I do not have my own server or anything, so I can't just send the text that user has written to there.
The only way I came up with is that the client would write a message and I would send it to an email account where I could read them. However, I do not want that users would need to send the reports through their personal accounts. I am not quite sure how I could implement this and googling didn't bring up any good suggestions.
I haven't done a lot of network stuff, so I'd really appreciate it if you could explain ( possibly even in code ) the process step-by-step.
I am using C# and the game is being programmed for Windows Phone 7.

Yes, it is absolutely possible to do that. From a relatively low-level perspective, you need to:
Resolve the MX (mail-exchanger) server for the e-mail account you want to send to.
Open a socket to the MX server.
Send the appropriate SMTP commands to cause the e-mail message to be delivered to your recipient account. You essentially have the freedom to set the "from" address to be any arbitrary thing you want.
SMTP is a very simple/human-friendly protocol, so it's not a massive effort to do all of that by hand. At the same time, there are prebuilt libraries that will handle all of that for you (except possibly the resolution of the recipient's MX server).
Note that emails sent this way are more likely to be filtered out as spam (generally because the sender's IP/hostname is not going to match whatever domain you put on the outgoing e-mail address you decide to use).
Also note that since you can set the "from" address to anything, you have the option of asking the user if they want to provide their actual contact address, and if they do you can make that the "from" address so that you can actually get back in touch with them if necessary.

You don't need to use email at all. Consider using an error reporting service like sentry or airbrake.
These services have clients that you embed in your program; which automatically log your errors, including any debugging information/stacktrace; and notify you by email when your application reports a problem.
Usually you integrate the app's API into your own error handling mechanism. At the point of an error, the client will capture your debugging information, you can popup a modal asking user for information like "what were you doing when this error happened?", save that as part of your error response that is sent back to the service.
Since the app works over HTTP, you don't need any special ports to be open. It is easier and more helpful than having users send you emails with "it doesn't work!!", and you don't have to deal with email sending headaches.

I recently wrote an article on this: Sending email with C#
You basically have two choices, either you send it using an SMTP-client, this means that you have to have a SMTP-server and be able to connect to port 25 (if you're not using an external SMTP, then you have to manage that by yourself). Or you can use an external email provider, such as:
AlphaMail
SendGrid
Mandrill
If you're using AlphaMail you can send emails in the following way:
IEmailService emailService = new AlphaMailEmailService()
.SetServiceUrl("http://api.amail.io/v1/")
.SetApiToken("YOUR-ACCOUNT-API-TOKEN-HERE");
var person = new Person()
{
Id = 1234,
UserName = "jdoe78",
FirstName = "John",
LastName = "Doe",
DateOfBirth = 1978
};
var response = emailService.Queue(new EmailMessagePayload()
.SetProjectId(12345) // ID of AlphaMail project (determines options, template, etc)
.SetSender(new EmailContact("support#company.com", "from#example.com"))
.SetReceiver(new EmailContact("Joe E. Receiver", "to#example.org"))
.SetBodyObject(person) // Any serializable object
);
Another thing that differs from just building HTML and sending it with an SMTP-client is that with AlphaMail you have the ability to edit your emails outside your code directly in a GUI. You can also easily create highly dynamic templates using AlphaMail's templating language Comlang.
<html>
<body>
<b>Name:</b> <# payload.FirstName " " payload.LastName #><br>
<b>Date of Birth:</b> <# payload.DateOfBirth #><br>
<# if (payload.Id != null) { #>
Sign Up Free!
<# } else { #>
Sign In
<# } #>
</body>
</html>

So this is my thought, why don't you have the email sent to you...as you?
using System.Net;
using System.Net.Mail;
var fromAddress = new MailAddress("from#gmail.com", "From Name"); //Both the email addresses would be yours
var toAddress = new MailAddress("to#example.com", "To Name"); //Both the email addresses would be yours
const string fromPassword = "fromPassword";
const string subject = "There name or whatever";
const string body = "Errors ect....";
var smtp = new SmtpClient
{
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = subject,
Body = body
})
{
smtp.Send(message);
}
code from here
All they would see would be the submit button so they wouldn't have all your personal username/password, also you should prolly set up a dummy account to have them sent to even if it just then forwards them to your real email account.

Another way to achieve this would be to host a WCF Service which takes in your Message and stores in db or /sends email. One downside of this is you'll need a web server to do this.

Try following code this might help you :
Dim objCDOMail
Set objCDOMail = Server.CreateObject("CDONTS.NewMail")
objCDOMail.From = "sender#domain.com"
objCDOMail.To = "receiver#domain.com"
objCDOMail.Subject = "Test Mail Script"
objCDOMail.BodyFormat = 0
objCDOMail.MailFormat = 0
objCDOMail.Body = "Testing Mail from Test Script"
objCDOMail.Importance = 1
objCDOMail.Send
Set objCDOMail = Nothing

C# smtp response

i have few question about smtp
im using this code to send mails if the host is gmail then it act diffrente:
foreach (string host in hosts)
{
SmtpClient sc = null;
try
{
if (emailDomain.ToLower() == "gmail.com")
{
MailSend.MailSendApp.EventLog.WriteEntry("mail to gmail.com");
sc = new SmtpClient("smtp.gmail.com", 587);
sc.UseDefaultCredentials = false;
sc.DeliveryMethod = SmtpDeliveryMethod.Network;
sc.Credentials = new NetworkCredential("UID#gmail.com", "PWD");
sc.EnableSsl = true;
} }
else
{
sc = new SmtpClient(host);
sc.Send(mailMessage);
break;
}
is it possiable to get answer from smtp :
1. that the email arrived
2. if the mail exists
thanks

If you want to receive a notification that the email has arrived you need to send the email with delivery notification options.
mailMessage.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
If the email doesn't exists, you will get an email back to your sender address and not to your SMTP class.
In short, there's no easy way to determine these two thing purely from the SMTP class perspective.

Back in the day you could directly query whether the email address exists on a given server (VRFY user SMTP command). Then, SPAM was born and pretty much all email servers removed that capability because spammers would use bots to query possible email recipients on each mail server to build SPAM lists.
You will still get an ordinary bounce report (email back to the reply-to address indicating that delivery failed). I use a tool called Boogie Tools to automate processing of bounce messages.
Gmail does not offer delivery or read receipts (though some email servers still optionally allow it) for similar reasons... too much abuse potential.

Email Sender App with Images on Local Machine

I have a small email application that lets a user build a message from checkboxes and then send the message as an email. I am trying to add an image to the email, i.e. a logo or signature. The application worked fine but as I was reseaching getting the images into the email, I found that I should be using System.Net.Mail instead of Interop. So I changed my email class to the code below. Now I'm not recieving the emails. I'm assumeing this is because the code is set-up for a server and I just want to run this on my local machine. This is just something I'm playing with to help me understand some concepts so real world use is not going to be a factor. I just want to be able to test my little program on my Outlook email account locally. My code is as follows...
using System;
using System.Net.Mail;
using System.Net.Mime;
namespace Email_Notifier
{
public class EmailSender:Notification
{
string emailRecipient = System.Configuration.ConfigurationManager.AppSettings ["emailRecipient"];
public void SendMail(string message)
{
try
{
string strMailContent = message;
string fromAddress = "MyApp#gmail.com";
string toAddress = emailRecipient;
string contentId = "image1";
string path = (#"C:Libraries/Pictures/Logo.gif");
MailMessage mailMessage = new MailMessage(fromAddress, toAddress);
mailMessage.Subject = "Email Notification";
LinkedResource logo = new LinkedResource( path , MediaTypeNames.Image.Gif);
logo.ContentId = "Logo";
// HTML formatting for logo
AlternateView av1 = AlternateView.CreateAlternateViewFromString("<html><body><img src=cid:Logo/><br></body></html>" + strMailContent, null, MediaTypeNames.Text.Html);
av1.LinkedResources.Add(logo);
mailMessage.AlternateViews.Add(av1);
mailMessage.IsBodyHtml = true;
SmtpClient mailSender = new SmtpClient("localhost");
mailSender.Send(mailMessage);
}
catch (Exception e)
{
Console.WriteLine("Problem with email execution. Exception caught: ", e);
}
return;
}
}
}

You specify mailSender = new SmtpClient("localhost");.
Have you set up an SMTP server on your local machine? If not, you will need to do so to use SmtpClient. Otherwise, specify a hostname other than localhost, perhaps using your Gmail account as specified here, bearing in mind you will need to configure it for authentication and SSL.
See also the documentation for SmtpClient.
There are also one or two other issues I can see with your code - but let's deal with these after getting simple mail sending working.

if your problem is that you don't have a smtp server you are talking to on your machine, you will see an exception rather than just silently not having your email delivered (which i believe is what you are seeing given that you did not list an exception, but not completely sure). it could be that you are successfully delivering to your local smtp server, but it is failing to send the mail on. if you have the iis smtp server installed and that is what you are trying to use to send the mail, you can see failed email messages in the subdirectories of C:\Inetpub\mailroot. there is a badmail subdirectory that should have failed deliveries.
if you are on windows 7, it doesn't support the iis smtp server. an alternative for having an smtp server on your machine that doesn't actually deliver the email but does show you everything that has come through for any email address is http://smtp4dev.codeplex.com/. even if i do have the iis smtp server available in my operating system, i prefer this for development needs.