SmtpServer for development environments
Installation: run with Administrator privileges FakeSmtpServer.exe install , it will install as windows service, but not run automatically
FakeSmtpServer.exe.config
<appSettings>
<add key="SmtpPort" value="25" />
<!--Tokens:
{TOs} - string joined by ,
{From}
{ReceviedDate:dd.MM.YYYY}
{Subject} -->
<add key="PathTemplate" value="d:\temp\mails\{ReceivedDate:yyyyMMdd}\{ReceivedDate:yyyyMMdd-HHmmssFFFFFFF}-{Subject}-{TOs}.eml" /> <!-- file template -->
</appSettings>Logging configuration: NLog.config
based on @rnwood smtp4dev