Pipelining allows the commands of the client machine to be sent without waiting for the
replies from the server machine.* The same dialog as before, but with pipelining enabled,
might look like the following (again the server is shown in bold font):
220 your.host ESMTP Sendmail 8.14.1/8.14.1; Thu, 14 Dec 2007 08:12:44 -0700 (MST)
EHLO some.domain.com
250-your.host.domain Hello some.domain.com [123.45.67.8], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING ?†? note this keyword
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
MAIL FROM:
RCPT TO:
DATA
250 2.1.0 ... Sender ok
250 2.1.5 ... Recipient ok
354 Enter mail, end with "." on a line by itself
?†? message sent, end with a dot
.
250 2.0.0 g1GFCigc025138 Message accepted for delivery
QUIT
221 2.0.0 your.host closing connection
In the preceding dialog, notice that the client issued the EHLO command instead of the
HELO command, as in the first example. One result of issuing the EHLO command is that
the server lists all the SMTP extensions it supports. Note that the list shows the PIPELINING
keyword. When this keyword is listed in response to the EHLO command, the
client is thereafter allowed to issue selected commands without waiting for a reply from the
server.
Pages:
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266