Sending Email from different local IPs

I recently had a question about aspNetEmail (thanks Clay!).  He wanted to know how he could use aspNetEmail to choose different local IPs for sending emails.

A little background
aspNetEmail creates it's own TCP/IP sockets to send email. What it does, is open a local TCP/IP socket, and establish a remote endpoint with the server specified by the .Server property.

When that local TCP/IP socket is created, aspNetEmail lets the .NET framework randomly select a local IP and Port to use. We can override the behavior by using the .LocalEndpoint property found on the EmailMessage object.

Here is a short but complete code example that demonstrates this functionality.

C#

EmailMessage msg = new EmailMessage( "127.0.0.1" );

msg.FromAddress = "me@mycompany.com";
msg.To = "you@yourcompany.com";

msg.Subject = "Your Order Confirmation Number is 12345";
msg.Body = "put our body contents here...";

//local endpoint -- this opens a local TCP/IP socket on IP 192.168.1.18 and port 5555
msg.LocalEndPoint = new IPEndPoint( IPAddress.Parse( "192.168.1.18" ), 5555 );

//if we only know the IP we want the socket open on, and not the port, we can 
//pass in 0 for the port, and the underlying OS will randomly pick an open port
//for example
//msg.LocalEndPoint = new IPEndPoint( IPAddress.Parse( "192.168.1.18" ), 0);

//any logging (not reqired) for troubleshooting
msg.LogPath = "c:\\temp\\email.log";
msg.Logging = true;

msg.Send();

VB.NET

Dim msg As New EmailMessage("127.0.0.1")

msg.FromAddress = "me@mycompany.com"
msg.To = "you@yourcompany.com"

msg.Subject = "Your Order Confirmation Number is 12345"
msg.Body = "put our body contents here..."

'local endpoint -- this opens a local TCP/IP socket on IP 192.168.1.18 and port 5555
msg.LocalEndPoint = New IPEndPoint(IPAddress.Parse("192.168.1.18"), 5555)

'if we only know the IP we want the socket open on, and not the port, we can 
'pass in 0 for the port, and the underlying OS will randomly pick an open port
'for example
'msg.LocalEndPoint = New IPEndPoint(IPAddress.Parse("192.168.1.18"), 0)

'any logging (not reqired) for troubleshooting
msg.LogPath = "c:\temp\email.log"
msg.Logging = True

msg.Send()

As always, if anyone has any questions, feel free to contact me over at Contact Us

Thanks!
Dave Wanta