Multiple address in MailAddress constructor

Question

i was trying to add multiple to address like this.

MailAddress mailAddressTo = new MailAddress("[email protected];[email protected]","Vetrivelmp");

but throws error like

An invalid character was found in the mail header: ';'

Answer 1

You cannot use the MailAddress constructor for specifying multiple receipts, but you can to use the MailMessage object as showed below.

Using the MailMessage (not MailAddress) constructor:

var msg = new MailMessage("[email protected]", "[email protected], [email protected]");

another way is:

MailMessage mail = new MailMessage();
mail.To.Add("[email protected],[email protected],[email protected]");

another way is:

MailMessage msg = new MailMessage();
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");

Answer 2

Actually, semicolon is not a valid delimiter. Unfortunately, MSDN does not document this, had to find out this by myself.

If you want to add more addresses, divide them by comma. And the space will divide display name and email address. The "To" property accepts following formats:

• [email protected]
• "[email protected], [email protected]"
• "Name [email protected]"
• "name [email protected], [email protected]"

etc...

I wrote more about this topic in this blog post

Answer 3

Use a comma (,) as the separator instead of semicolon (;).

If multiple e-mail addresses separated with a semicolon character (";") are passed in the addresses parameter. a FormatException exception is raised.

• MailAddressCollection.Add(String) Method

Examples that work

MailAddressCollection.Add(String):

using (MailMessage msg = new MailMessage())
{
  ...
  msg.To.Add("[email protected], [email protected]");
  ...
}

MailAddressCollection.Add(MailAddress):

using (MailMessage msg = new MailMessage())
{
  ...
  msg.To.Add(new MailAddress("[email protected]", "Vetrivelmp"));
  msg.To.Add(new MailAddress("[email protected]", "Vetrivelmp1"));
  ...
}