Two SMTP servers respond identically if I imitate the bb-services (send "mail" cr-lf, "quit" cr-lf) dialog using telnet, but give different Hobbit display results.

[root at bump02 hobbit]# telnet 127.0.0.218 25 Trying 127.0.0.218... Connected to 127.0.0.218 (127.0.0.218). Escape character is '^]'. 220 SMTP ESMTP mail 501 5.5.2 Syntax error in parameters scanning "" quit 221 2.0.0 p1ie.pen.k12.va.us closing connection Connection closed by foreign host.

bb-service expects "220", but Hobbit gives a yellow ball and shows banner:

Service smtp on p1ie is not OK : Unexpected service response 554 p1ie.pen.k12.va.us ESMTP not accepting messages 550 5.0.0 Command rejected 221 2.0.0 p1ie.pen.k12.va.us closing connection

However,

[root at bump02 hobbit]# telnet 127.0.0.206 25 Trying 127.0.0.206... Connected to 127.0.0.206 (127.0.0.206). Escape character is '^]'. 220 SMTP ESMTP mail 501 5.5.2 Syntax error in parameters scanning "" quit 221 2.0.0 pen3.pen.k12.va.us closing connection Connection closed by foreign host.

Here Hobbit correctly gives a green ball and shows banner:

Service smtp on pen3.pen.k12.va.us is OK (up) 220 SMTP ESMTP

Any idea why it would give different results for identical client responses?