SmtpMail::SmtpServer Property
Gets or sets the name of the SMTP relay mail server to use to send e-mail messages. Recommended alternative: System.Net.Mail.
Assembly: System.Web (in System.Web.dll)
If your local SMTP server (included with Windows 2000 and Windows Server 2003) is behind a firewall that blocks any direct SMTP traffic (through port 25), you will need to find out if there is a smart host available on your network that is allowed to relay SMTP messages to the Internet.
A smart host is an SMTP server with the permissions to relay outgoing e-mail messages directly to the Internet from internal SMTP servers. A smart host should be able to simultaneously connect to both the internal network and the Internet in order to work as the e-mail gateway.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.