A roundhouse is a maintenance facility used by railroads. Roundhouses are the large, circular or semicircular structures that are located surrounding or adjacent to turntables. The roundhouse in a railroad yard is typically where steam locomotives were stored when they weren't in use.
This is an SMTP multiplexer, which takes the input from an SMTP client connection and copies it to one or more SMTP servers. Intended as means to debug and test different mail server configurations using a production mail server's live data stream.
[-avw] [-g group] [-p port] [-t timeout] [-u user]server ...
Currently tested platforms:
Cobalt Qube 1 with Linux RH 5.1 (mips 2.0.34 kernel);
Windows XP Pro SP2;
When using Roundhouse on the same server as two or more Sendmail daemons, each Sendmail instance must be listening on a port other than 25, which Roundhouse will be listening on. Either modify each daemon's sendmail.mc/cf file or specify the command line option -ODaemonPortOptions=Port=NNN. For example:
# sendmail -ODaemonPortOptions=Port=26 # sendmail -ODaemonPortOptions=Port=27
Then start Roundhouse to multiplex to the two local Sendmail daemons:
# roundhouse 127.0.0.1:26 ::1,27 other.host.example.com
Note that Roundhouse supports IPv6 addresses, but in order to distinguish between the address and the port, a comma or other punctuation character must be used instead of a colon.
Roundhouse does not currently multiplex STARTTLS sessions. Instead it forwards the STARTTLS and the remainder of the input stream to the first SMTP server in the server list. This should be your primary SMTP server.
Roundhouse supports AUTH PLAIN and AUTH LOGIN. An AUTH LOGIN is converted to an AUTH PLAIN before being forwarded to the SMTP server list.
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train spotters since 23 October 2005