[Mimedefang] Bare returns in message body

[David F. Skoll]

Joseph Brennan wrote:

> We're interested in patching mimedefang.c to do this, but have this
> funny feeling that there is a good reason David removes them.  What
> would it break?

I can't remember why I remove them (it's been a while), but I did
have a good reason.

RFC 2821 says:

   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.

RFC 2822 says:

   - CR and LF MUST only occur together as CRLF; they MUST NOT appear
     independently in the body.

Note that these are MUST NOT requirements, not SHOULD NOT requirements.
So in theory, it is OK to reject such messages.

Regards,

David.