I am trying to connect to iCloud via SmtpClient
The settings I am using are as follows:
Server name: smtp.mail.me.com
SSL Required: Yes
If you see an error message when using SSL, try using TLS or STARTTLS instead.
Port: 587
SMTP Authentication Required: Yes - with relevant username and password
If I use SSL I get "Handshake failed due to unexpected packet format"
If I don't use SSL visual studio debugger hangs on connect.
I think the problem is I am not telling the SmtpClient to use tls but I cant find documentation on how to do this.
The code is as follows:
using (var client = new SmtpClient()) {
client.Timeout = 1000 * 20;
//client.Capabilities.
client.AuthenticationMechanisms.Remove ("XOAUTH2");
client.Connect("SMTP.mail.me.com", 587, false); //dies here
//client.Connect(servername, port, useSsl);
//can I set tls or starttls here??
client.Authenticate(username, password);
client.Send(FormatOptions.Default, message);
}
Am I able to set TLS or StartTLS manually. One thing I did try is the following but it did not seem to work
client.Connect(new Uri("smtp://" + servername + ":" + port + "/?starttls=true"));
Thanks for any help with this.
The Connect() method that you are using only allows enabling/disabling SSL-wrapped connections which is not the same thing as StartTLS.
Due to the confusion, I've implemented a separate Connect() method that makes this more obvious what is going on:
using (var client = new SmtpClient()) {
// Note: don't set a timeout unless you REALLY know what you are doing.
//client.Timeout = 1000 * 20;
client.Connect ("smtp.mail.me.com", 587, SecureSocketOptions.StartTls);
client.Authenticate (username, password);
client.Send (message);
}
Try that.
You can set your options to "SecureSocketOptions.Auto" something like this
await client.ConnectAsync(mailService.Host, mailService.Port, SecureSocketOptions.Auto);
MailKit will automatically decide to use SSL or TLS.
According to MailKit Doc
Connect(string host,int port,bool useSsl,CancellationToken cancellationToken = null)
The useSsl argument only controls whether or not the client makes an SSL-wrapped connection. In other words, even if the useSsl parameter is false, SSL/TLS may still be used if the mail server supports the STARTTLS extension.