Does the EHLO response break RFC2821 syntax?

[Paul Overell <paul.overell@thus.net>]

Hi, I've just started using ZMailer.  I'm using version 2.99.57-pre4 on 
a Solaris 9 SPARC.

If a EHLO command is issued by the client, without the required domain 
parameter, then ZMailer still accepts it and returns a 250 response, no 
problem.

However, the 250 response contains a error message as follows:

>220 localhost ZMailer Server 2.99.57.pre4 #1 ESMTP ready at Fri, 12 May 
>2006 10:57:20 +0000
>ehlo
>250-Invalid `ehlo' parameter!
>250-5.7.1 Sorry [127.0.0.1], Err: RFC821: No input
>250-localhost expected "EHLO localhost"
>250-SIZE 0
>250-8BITMIME
>250-PIPELINING
>250-CHUNKING
>250-ENHANCEDSTATUSCODES
>250-DSN
>250-X-RCPTLIMIT 10000
>250-ETRN
>250 HELP


This seems to me to be a breach of RFC2821 syntax

>      ehlo-ok-rsp  =    ( "250"    domain [ SP ehlo-greet ] CRLF )
>                   / (    "250-"   domain [ SP ehlo-greet ] CRLF
>                       *( "250-"   ehlo-line                CRLF )
>                          "250"    SP ehlo-line             CRLF  )
>
>      ehlo-greet   = 1*(%d0-9 / %d11-12 / %d14-127)
>                   ; string of any characters other than CR or LF
>
>      ehlo-line    = ehlo-keyword *( SP ehlo-param )
>
>      ehlo-keyword = (ALPHA / DIGIT) *(ALPHA / DIGIT / "-")
>                   ; additional syntax of ehlo-params depends on
>                   ; ehlo-keyword

None of the three error message lines above conform to the ehlo-line 
syntax, a breach of RFC2821.

Surely, if ZMailer wishes to return an error message in this case then 
shouldn't it be contained in the ehlo-greet part of the response, and 
not in an ehlo-line?

Or have I misconfigured ZMailer?

Regards
-- 
Paul Overell         Internet Platform Development Manager, Thus plc
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