Custom monitor for SMTP servers

I got it to work. I didn't need the initial "send telnet" as the scripted monitor does that to begin with. Unfortunately, I can't use pop/imap/etc as this is to test an exim gateway and can't necessarily "retrieve" the e-mail from the impacted system. doing an "ehlo" on localhost rounds it out nicely. Here's what I ended with:

expect 220
send "HELO localhost\r\n"
expect "250"
send "MAIL FROM: @localhost\r\n"
expect "250"
send "RCPT TO: @localhost\r\n"
expect "250"
send "DATA\r\n"
expect "354"
send "SUBJECT:F5 LTM SMTP Health Check\r\n"
send "\r\n"
send "This e-mail is generated by the SMTP health check by the F5 LTM.\r\n"
send ".\r\n"
expect "250"
send "quit\r\n"
expect "221"

where

= a local account that the mailbox has been redirected to /dev/null. If /var is full, I get an error of not being able to write to spooler, otherwise, I get a 250 OK.