.Net 2.0 send email with multiple “To” recipients

.Net 2.0 send email with multiple “To” recipients

• kazor

  Just realized this was posted last October. I can't believe this still hasn't been revised in the documentation!

  This is the only thing that worked for me:

  mailMessage.To.Add("<add1@mail.com>,<add2@mail.com>")

  You may pass it as a string.

  
  
  

• momak

  MailAddress to1 = new MailAddress("address2@xxx.com;","name1");

  MailAddress to2 = new MailAddress("address3@xxx.com","name2");
  
  Thats not the right way to add multiple recipients
  
  use the example I used above.
  
  PLUS you are using a ; at the end of the first mail address.
  
  
  

  
  
  

• BubbleGum

  ok i am trying to pass in email addresses sepertated by comma's into the toaddress like so... they are in a listbox1 on my page.
  
  

  Dim emailgroup As String

  emailgroup = ListBox1.SelectedValue.ToString

  'Create a new MailMessage object and specify the "From" and "To" addresses

  Dim fromAddress As New Net.Mail.MailAddress(info@learnbartending.com, "Jeff ")

  Dim toAddress As New Net.Mail.MailAddress("emailgroup")

  Dim msg As New Net.Mail.MailMessage(fromAddress, toAddress)

  Dim Email As New System.Net.Mail.MailMessage(fromAddress, toAddress)

  
  

• Bdy

  I had the same problem, rather than change all of my code, I changed my main mail routine as follows.

  This works for me, let me know if you have any questions.

  Public Function SendEMail(ByVal strFrom As String, ByVal strTo As String, ByVal strCC As String, ByVal strBcc As String, ByVal strSubject As String, ByVal strBody As String, Optional ByVal strAttachment As String = "", Optional ByVal strBodyType As String = "") As String
  Try

  Dim MailMsg As New MailMessage

  MailMsg.From = New MailAddress(strFrom)

  
  If strTo <> "" Then

  Dim strToArray As String()
  strToArray = strTo.Split(";")

  Dim ToInt As Integer = strToArray.Length
  Dim Tocount As Integer = 0

  While Tocount < ToInt
  MailMsg.To.Add(New MailAddress(strToArray(Tocount)))
  Tocount = Tocount + 1
  End While
  Else
  Return "error; No To Adress Specified"
  End If

  
  If strCC <> "" Then

  Dim strccArray As String()
  strccArray = strCC.Split(";")

  Dim ccInt As Integer = strccArray.Length
  Dim ccCount As Integer = 0

  While ccCount < ccInt
  MailMsg.CC.Add(New MailAddress(strccArray(ccCount)))
  ccCount = ccCount + 1
  End While

  End If

  
  If strBcc <> "" Then

  Dim strBccArray As String()
  strBccArray = strBcc.Split(";")

  Dim BccInt As Integer = strBccArray.Length
  Dim BccCount As Integer = 0

  
  While BccCount < BccInt
  MailMsg.Bcc.Add(New MailAddress(strBccArray(BccCount)))
  BccCount = BccCount + 1
  End While

  End If

  MailMsg.Subject = strSubject
  MailMsg.Body = strBody

  If strBodyType <> "" Then
  Select Case LCase(strBodyType)
  Case "html"
  MailMsg.IsBodyHtml = True
  Case "text"
  MailMsg.IsBodyHtml = False
  End Select
  End If

  
  If strAttachment <> "" Then

  Dim strAttachmentArray As String()
  strAttachmentArray = strAttachment.Split(";")

  Dim AttachmentInt As Integer = strAttachmentArray.Length
  Dim AttachmentCount As Integer = 0

  While AttachmentCount < AttachmentInt
  MailMsg.Attachments.Add(New Attachment(strAttachmentArray(AttachmentCount)))
  AttachmentCount = AttachmentCount + 1
  End While

  End If

  Dim MailServerName As String = "PutYourServerNameHere"
  

  Dim mSmtpClient As New SmtpClient
  mSmtpClient.Host = MailServerName

  Try
  mSmtpClient.Send(MailMsg)
  Catch objException As Exception
  SendNotificationMsg = objException.Message
  End Try

  mSmtpClient = Nothing

  For Each aAttach As Attachment In MailMsg.Attachments
  aAttach.Dispose()
  Next

  MailMsg.Attachments.Dispose()
  MailMsg.Dispose()
  MailMsg = Nothing

  Catch ex As Exception
  Return "error"
  End Try
  Return "Sent"
  End Function

  
  

• wiu joe

  Thanks, that fixed it.

  The thing that confused me is you could specify multiple to address’s separated by “;” in .Net 1.1, but this wont work in 2.0

  e.g.
  MailMessage msg = new MailMessage(‘FromAddress’,’ToAddress1;ToAddress2’);

  
  

• BJBarry

  I'm converting a VB.NET 1.1 app to 2.0 and the mail functions are giving me the most trouble with the lack of support for delimited addresses. The following line of code throws an invalid address exception for me:

  Dim objMessage As MailMessage = New MailMessage()

  
  

• treidel

  One thing that I've recently found regarding the comma thing is that in 1.1 as was mentioned above, to go to a list of addresses using on string, you used to separate your addresses by semi-colons. 
  i.e.    
  MailMessage myMail = new MailMessage();

  myMail.To = "blah@blah.com; blah2@blah.com";
  
  Now in 2.0
  that would look like:
  MailMessage myMail = new MailMessage();

  myMail.To.Add("blah@blah.com, blah2@blah.com");
  
  Hope that is a little more clear for anyone else looking for this.

  
   

  
  

• Carl Berger

  After reading Durga's post, if you are still having problems, please post your code.  Also, if you are getting an exception, please post the full exception message.

  
  
  

• JimMace

  Point taken.

  Thanks

  
  
  

• JonHAL

  No your statement is not correct
  The following code works great for me.
  You should use , separated addresses, not ;
  If you used ; it would have thrown an exception
  Unhandled Exception: System.FormatException: The specified string is not in the form required for an e-mail address.
     at System.Net.Mime.MailBnfHelper.ReadMailAddress(String data, Int32& offset, String& displayName)
     at System.Net.Mime.MailBnfHelper.ReadMailAddress(String data, Int32& offset)
     at System.Net.Mail.MailAddressCollection.ParseValue(String addresses)
     at System.Net.Mail.MailAddressCollection.Add(String addresses)
     at System.Net.Mail.Message..ctor(String from, String to)
     at System.Net.Mail.MailMessage..ctor(String from, String to)
     at Test.Main()
  
  
  
  

  using System; using System.Net.Mail; public class Test {  public static void Main()  {   SmtpClient client = new SmtpClient("smtphost", 25);   MailMessage msg = new MailMessage("x@y.com", "a@b.com,c@d.com");   msg.Subject = "sdfdsf";   msg.Body = "sdfsdfdsfd";   client.UseDefaultCredentials = true;   client.Send(msg);  } }

  
  
  

• Glen Bartlett

  First of all, I don't see anywhere that you are creating a comma delimited list of to addresses.
  i.e.
  string emailGroup = string.Empty;
  ListBox.SelectedIndexCollection indexes = listBox1.SelectedIndices;
  Net.Mail.MailAddress toAddresses;
  
  //go through each selected item and pull back the value
  foreach (int index in indexes)
  {
     emailGroup += (string) listBox1.Items[index] + ",";
  }
  
  //removes the last comma
  emailGroup = emailGroup.Remove(emailGroup.Length - 1);
  
  Secondly, when you create the email address, you need to pass the name of the variable not enclosed in quotes.
  i.e.
  toAddresses = new Net.Mail.MailAddress(emailGroup)
  
  Please let me know if this doesn't solve your problem.
  
  Disclaimer: the above loop would be made more efficient with a stringbuilder class.  For sake of clairity I used what Jeff was using.
  

• scalpa

  Hi, I am seeing the same exception too. Following is my code:
  
  

  public void SendMail()

  {

  MailAddress from = new MailAddress(address1@xxx.com,"name3");

  MailAddress to1 = new MailAddress("address2@xxx.com;","name1");

  MailAddress to2 = new MailAddress("address3@xxx.com","name2");

  MailMessage EMessage = new MailMessage(from, to1);

  EMessage.Body = this.G_EmailContent;

  EMessage.IsBodyHtml = true;

  EMessage.Subject = "subject1";

  EMessage.To.Add(to1.Address);

  EMessage.To.Add(to2.Address);

  EMessage.From = from;

  SmtpClient mailClient = new SmtpClient("server_name");

  mailClient.UseDefaultCredentials = true;

  mailClient.Send(EMessage);

  }
  
  exception:
  
  Unhandled Exception: System.FormatException: The specified string is not in the form required for an e-mail address.
     at System.Net.Mime.MailBnfHelper.ReadMailAddress(String data, Int32& offset, String& displayName)
     at System.Net.Mail.MailAddress.ParseValue(String address)
     at System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding)
     at System.Net.Mail.MailAddress..ctor(String address, String displayName)
     at TechNetAutomation.EmailBuildReport.SendMail()
     at TechNetAutomation.EmailBuildReport.RunReport()
     at TechNetAutomation.RunAutomation.Main(String[] args)

  
  
  

• el_richard

  Why can't you send to multiple TOs
  What is the problem you are having

  We definitely support this feature.
  
  Use code something like

  MailMessage msg = new MailMessage();
  msg.To.Add(new MailAddress("blah1"));
  msg.To.Add(new MailAddress("blah2"));
  msg.To.Add(new MailAddress("blah3"));

  etc.

  
  
  

• A-Ka

  OK, so why didn't Microsoft:

  1. Put this in the documentation MailAddressCollection.Add(string) mentions NOTHING about the delimiter.

  2. Simply leave the delimiter alone, or support both What a pain in the neck! 

  
  
• .Net 2.0 send email with multiple “To” recipients