The handshake failed due to an unexpected packet format
Most likely your server requires implicit SSL. So first try to connect without SSL:
// C#
client.Connect("imap.example.com");
' VB.NET
client.Connect("imap.example.com");
Then, before logging-in, start implicit SSL negotiation. The command name differs for different protocols:
In case of IMAP:
// C# client.StartTLS();
' VB.NET client.StartTLS()
In case of POP3:
// C# client.STLS();
' VB.NET client.STLS()
In case of SMTP:
// C# client.StartTLS();
' VB.NET client.StartTLS()
Now, your connection is secured.
Remember that you can ignore SSL certificate errors using ServerCertificateValidate event:
// C#
client.ServerCertificateValidate +=
(sender, e) => { e.IsValid = true; };
' VB.NET client.ServerCertificateValidate += Function(sender, e) Do e.IsValid = True End Function
