custom smtp test

I'd like to test sending a message to a null address via SMTP. I tried to do by adding the following test to bb-services and bb-hosts:

[send] send "ehlo\r\nmail from: <hobbit at foo.com>\r\nrcpt to: <null at bar.com>\r\ndata\r\n.\r\nquit\r\n" expect "250 Accepted message" options banner port 25

Lo, a send column appeared. It's acting funny, though. The messages are definitely getting sent, but the status stays yellow, and the only output it captures is "220 bar.com ESMTP".

Is this a silly way to do such a test? Does Hobbit time out too rapidly to see the rest of the output? I looked through the code for bbtest-net, but I'm not good enough at select loops to figure out what it's doing.

Thanks, Matti