Question

I get a message saying the server requires authentication when i get to the bottom line of the following code block.

MailMessage message = new MailMessage();
message.From = new MailAddress("[e-mail]");

message.To.Add(new MailAddress("[e-mail]"));

message.Subject = "Message subject";
message.Body = "This is the content";

SmtpClient client = new SmtpClient();
client.Send(message);

However, I thought I had already given it the info it requires in webconfig as follows:

<mailSettings>
  <smtp from="[e-mail]">
    <network host="mySMTPserver" port="25" userName="myEmail" password="myPass" />
  </smtp>
</mailSettings>

Any advice much appreciated, I read many posts on here and they all seem to be providing the login in the same way.

Answer 1

Two things to try:

SET
client.UseDefaultCredentials = false

SET port:

 client.Port = 587

These properties can also be set in the .config file

To understand why 587, see
http://mostlygeek.com/tech/smtp-on-port-587/