Handling Exceptions

Exceptions thrown by Mail component can be easily caught by using try catch block. The table below lists all exceptions relating to the Mail component: 

The example below shows how to handle exceptions:

using System;
using System.Text;
using ComponentPro.Net;
using ComponentPro.Net.Mail;

...

// POP3 server information. 
const string serverName = "myserver";
const string user = "name@domain.com";
const string password = "mytestpassword";
const int port = 995;
const SslSecurityMode securityMode = SslSecurityMode.Implicit;

// Create a new instance of the Pop3 class.
Pop3 client = new Pop3();

try
{
    // Connect to the server. 
    client.Connect(serverName, port, securityMode);

    // Login to the server. 
    client.Authenticate(user, password);

    StringBuilder sb = new StringBuilder();

    Pop3MessageCollection list = client.ListMessages(Pop3EnvelopeParts.Size | Pop3EnvelopeParts.UniqueId);
    for (int i = 0; i < list.Count; i++)
    {
        sb.AppendFormat("{0} - {1}\r\n", i + 1, list[i].UniqueId);
    }

    Console.WriteLine(sb.ToString());

    // Close the connection. 
    client.Disconnect();
}
catch (Exception exc)
{
    // Show error. 
    Console.WriteLine("Error: " + exc.Message);

    // Safely disconnect. 
    if (client.IsConnected)
        client.Disconnect();
}

Imports System.Text
Imports ComponentPro.Net
Imports ComponentPro.Net.Mail

...

' POP3 server information. 
Const serverName As String = "myserver" 
Const user As String = "name@domain.com" 
Const password As String = "mytestpassword" 
Const port As Integer = 995
Const securityMode As SslSecurityMode = SslSecurityMode.Implicit

' Create a new instance of the Pop3 class. 
Dim client As New Pop3()

Try 
    ' Connect to the server. 
    client.Connect(serverName, port, securityMode)

    ' Login to the server. 
    client.Authenticate(user, password)

    Dim sb As New StringBuilder()

    Dim list As Pop3MessageCollection = client.ListMessages(Pop3EnvelopeParts.Size Or Pop3EnvelopeParts.UniqueId)
    For i As Integer = 0 To list.Count - 1
        sb.AppendFormat("{0} - {1}" & vbCrLf, i + 1, list(i).UniqueId)
    Next i

    Console.WriteLine(sb.ToString())

    ' Close the connection. 
    client.Disconnect()
Catch exc As Exception
    ' Show error. 
    Console.WriteLine("Error: " & exc.Message)

    ' Safely disconnect. 
    If client.IsConnected Then 
        client.Disconnect()
    End If 
End Try