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Full Discussion: Problem with forwarding emails (SPF problem)
Special Forums IP Networking Problem with forwarding emails (SPF problem) Post 302547595 by carwe on Tuesday 16th of August 2011 06:17:08 AM
Old 08-16-2011
Problem with forwarding emails (SPF problem)
Hi,

This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question.

I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I need to solve this matter.

(Below I have replaced parts of personal email adresses with [...].)

I have an adress c[...]_AT_fysik.su.se which forwards all email to carl_AT_w[...].com:
c[...]_AT_fysik.su.se -> carl_AT_w[...].com
The latter is hosted by one.com.

The sender, someone at xilinx.com, sent to c[...]_AT_fysik.su.se but got a bounce. The complete bounce message is included under this message.

When following the link to the openspf page I can read, among other things, the following:

//
mx-v.one.com rejected a message that claimed an envelope sender address of p[...]_AT_xilinx.com.

mx-v.one.com received a message from smtp3.su.se (130.237.164.77) that claimed an envelope sender address of p[...]_AT_xilinx.com.

However, the domain xilinx.com has declared using SPF that it does not send mail through smtp3.su.se (130.237.164.77). That is why the message was rejected.
//

So apparently my ISP one.com doesn't want to recieve the email.

The one.com sys admin blames xilinx.com, the fysik.su.se admin doesn't have a clear idea of why this happens (except that it isn't the fault of su.se).

What is really causing the bounces and what could I do to fix this? The problem seems to persist for all emails sent by this particular sender (at xilinx.com), however, myself and others can send emails to my su.se adress and they are forwarded without problems.

Thanks alot,
Carl



-----Original Message-----
From: Mail Delivery System [mailto:MAILER-DAEMON_AT_smtp.su.se]
Sent: 08 August 2011 08:12
To: Peadar Delaney
Subject: Undelivered Mail Returned to Sender

This is the mail system at host smtp.su.se.

I'm sorry to have to inform you that your message could not be delivered
to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster_AT_su.se

If you do so, please include this problem report. You can delete your
own text from the attached returned message.

The mail system

<carl_AT_w[...].com>: host mx-cluster-d2.one.com[195.47.247.199] said:
554 5.7.1
<carl_AT_w[...].com>: Recipient address rejected: Please see

www[dot]openspf.org/why.html?sender=pead[...]%40xilinx.com&ip=13
0.237.164.77&receiver=mx-v.one.com
(in reply to RCPT TO command)


This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.



Delivery report.txt

Reporting-MTA: dns; smtp.su.se
X-Postfix-Queue-ID: 198C2E0F5
X-Postfix-Sender: rfc822; p[...]_AT_xilinx.com
Arrival-Date: Mon, 8 Aug 2011 09:12:10 +0200 (CEST)

Final-Recipient: rfc822; carl_AT_w[...].com
Original-Recipient: rfc822;c[...]_AT_fysik.su.se
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx-cluster-d2.one.com
Diagnostic-Code: smtp; 554 5.7.1 <carl_AT_w[...].com>: Recipient address
rejected: Please see
www[dot]openspf.org/why.html?sender=pead[...]%40xilinx.com&ip=130.237.164.77&receiver=mx-v.one.com
 

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libssh2_channel_x11_req_ex

libssh2_channel_x11_req_ex(3)					  libssh2 manual				     libssh2_channel_x11_req_ex(3)

NAME

       libssh2_channel_x11_req_ex - request an X11 forwarding channel

SYNOPSIS

       #include <libssh2.h>

       int  libssh2_channel_x11_req_ex(LIBSSH2_CHANNEL	*channel,  int	single_connection,  const  char  *auth_proto, const char *auth_cookie, int
       screen_number);

       int libssh2_channel_x11_req(LIBSSH2_CHANNEL *channel, int screen_number);

DESCRIPTION

       channel - Previously opened channel instance such as returned by libssh2_channel_open_ex(3)

       single_connection - non-zero to only forward a single connection.

       auth_proto - X11 authentication protocol to use

       auth_cookie - the cookie (hexadecimal encoded).

       screen_number - the XLL screen to forward

       Request an X11 forwarding on channel. To use X11 forwarding, libssh2_session_callback_set(3) must first	be  called  to	set  LIBSSH2_CALL-
       BACK_X11. This callback will be invoked when the remote host accepts the X11 forwarding.

RETURN VALUE

       Return 0 on success or negative on failure.  It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a
       negative number, it isn't really a failure per se.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

       LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

       LIBSSH2_ERROR_CHANNEL_REQUEST_DENIED -

SEE ALSO

       libssh2_channel_open_ex(3) libssh2_session_callback_set(3)

libssh2 0.15							    1 Jun 2007					     libssh2_channel_x11_req_ex(3)
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