In addition to failing the RSET command, the following relay test failed:
To: lindy
From: spamtest@[doman.com]
<<< 250 Requested mail action okay, completed
>>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>>> RCPT TO:
<<< 501 Syntax error in email address
To:
lindy@doman.com
From:
spamtest@domain.com
<<< 250 Requested mail action okay, completed
>>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>>> RCPT TO:
<<< 250 Requested mail action okay, completed
>>>> DATA
<<< 354 Start mail input; end with .
>>>> MESSAGE
<<< 250 Requested mail action okay, completed
SUCCESS
Relay Accepted - final response code 250