[RFCI-Discuss] multi-MAIL commands appearing in the same mail-transaction?

[Jeff Pang]

When I read RFC2821,I saw that it permit multi-MAIL FROM commands appear in the same mail transaction.
For example:

HELO abcd.163.com
MAIL FROM:<abc at 163.com>
MAIL FROM:<def at 163.com>
....


Those statements are seem permitted by RFC2821.

But many MTAs don't permit that.Are they right?For example,for our 163's MTAs:

$ telnet mx.mail.163.split.netease.com 25
Trying 220.181.12.53...
Connected to m12-53.163.com (220.181.12.53).
Escape character is '^]'.
220 163.com Coremail SMTP(Anti Spam) System
helo gmail.com
250 OK
mail from:<abc at gmail.com>
250 Mail OK
mail from:<def at gmail.com>
503 bad sequence of commands


Is this a RFC violation?Thank you.


--
Jeff Pang
NetEase AntiSpam Team
http://corp.netease.com