Wael MANAI:
> What do you mean "security software"? It's postfix which adds
> 250-PIPELINING...
You are mistaken.
The "security" software sends
250 whatever
250-PIPELINING
552 whatever
The 250-PIPELINING is NOT PART OF THE EHLO RESPONSE.
In RFC 5321, section "4.2.1. Reply Code Severities and Theory"
The format for multiline replies requires that every line, except the
last, begin with the reply code, followed immediately by a hyphen,
"-" (also known as minus), followed by text. The last line will
begin with the reply code, followed immediately by <SP>, optionally
some text, and <CRLF>. As noted above, servers SHOULD send the <SP>
if subsequent text is not sent, but clients MUST be prepared for it
to be omitted.
Wietse