Virtualni mail hosting (Was: Sendmail remote root)

[feyd na seznam.cz]

On Fri, 7 Mar 2003 10:56:29 +0000 (UTC)
janousek na fonet.cz (Ing. Pavel PaJaSoft Janousek) wrote:

> Ondrej Sury wrote:
> > Uvedte konkretni priklad...  nebo alespon odkaz na konkretni
> > priklad. qmail odmita zpravy, kdy remote MTA nepouzije CRLF jako
> > EOLN, na jine omezeni si nevzpominam.
> 
> 	V RFC pro SMTP neni toto jasne uvedeno? Tedy abych byl spravne 

Je (rfc 2821):

.
.
.

2.3.7 Lines

   SMTP commands and, unless altered by a service extension, message
   data, are transmitted in "lines".  Lines consist of zero or more data
   characters terminated by the sequence ASCII character "CR" (hex value
   0D) followed immediately by ASCII character "LF" (hex value 0A).
   This termination sequence is denoted as <CRLF> in this document.
   Conforming implementations MUST NOT recognize or generate any other
   character or character sequence as a line terminator.  Limits MAY be
   imposed on line lengths by servers (see section 4.5.3).

   In addition, the appearance of "bare" "CR" or "LF" characters in text
   (i.e., either without the other) has a long history of causing
   problems in mail implementations and applications that use the mail
   system as a tool.  SMTP client implementations MUST NOT transmit
   these characters except when they are intended as line terminators
   and then MUST, as indicated above, transmit them only as a <CRLF>
   sequence.

.
.
.

4.1.1.4 DATA (DATA)

.
.
.

   The custom of accepting lines ending only in <LF>, as a concession to
   non-conforming behavior on the part of some UNIX systems, has proven
   to cause more interoperability problems than it solves, and SMTP
   server systems MUST NOT do this, even in the name of improved
   robustness.  In particular, the sequence "<LF>.<LF>" (bare line
   feeds, without carriage returns) MUST NOT be treated as equivalent to
   <CRLF>.<CRLF> as the end of mail data indication.


feyd