can't send mails anymore

Hello,

all of a sudden I am not able to send mails anymore (using KMail). I have an
account at gmx.de, the mail server for sending mails is mail.gmx.net Kmail
is configured as described in the how to from gmx.de (Authenticaiton, TLS,
etc.).

I can ping and traceroute this server, a telnet mail.gmx.net 25 doesn't
work. The error message of KMail doesn't say anything, just that it can't
connect the server.

Sending mails worked until recently, I think I haven't changed anything - at
least I am not aware of.

Any idea how I can troubleshoot this situation?

Thanks a lot, regards,
Jochen

"Jochen Rundholz" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)

> all of a sudden I am not able to send mails anymore (using KMail). I
> have an account at gmx.de, the mail server for sending mails is
> mail.gmx.net Kmail is configured as described in the how to from
> gmx.de (Authenticaiton, TLS, etc.).
>
> I can ping and traceroute this server, a telnet mail.gmx.net 25
> doesn't work. The error message of KMail doesn't say anything, just
> that it can't connect the server.

$ telnet mail.gmx.net 25
Trying 213.165.64.20...
Connected to mail.gmx.net.
Escape character is '^]'.
220 {mp016} GMX Mailservices ESMTP
help
214 2.0.0 {mp016} You're on your own
quit
Connection closed by foreign host.
$

Works here.

> Sending mails worked until recently, I think I haven't changed
> anything - at least I am not aware of.
>
> Any idea how I can troubleshoot this situation?

Your ISP may have started blocking outbound port 25 connections from all but
their own mail servers. If you have tcptraceroute installed then use it to
see where the failure occurs:

$ tcptraceroute mail.gmx.net 25
Tracing the path to mail.gmx.net (213.165.64.20) on TCP port 25, 30 hops max
....
12 schlund-gw.ip.tiscali.net (213.200.65.202) 368.883 ms 318.367 ms
368.746 ms
13 so-5000.gw-backbone-a.bs.ka.schlund.net (212.227.120.6) 358.881 ms
348.419 ms 358.385 ms
14 a0kac1a.gw-distg-a.bs.ka.schlund.net (212.227.116.214) 348.904 ms
348.275 ms 348.836 ms
15 * * *
16 imap.gmx.net (213.165.64.20) [open] 339.061 ms 318.441 ms 368.582 ms

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>
> Your ISP may have started blocking outbound port 25 connections from all

I tried a different server with port 25, this seems to work.

jochen@tux:~> telnet mail.web.de 25
Trying 217.72.192.157...
Connected to mail.web.de.
Escape character is '^]'.
220 smtp06.web.de ESMTP WEB.DE V4.103#192 Sat, 19 Feb 2005 09:26:11 +0100

This confuses me now even more, my ISP seems not to block anything (or at
least not generally port 25), my Linux box must be okay as well since it
works for web.de. Very strange

> but their own mail servers. If you have tcptraceroute installed then use
> it to see where the failure occurs:

I just downloaded it:

Version 1.4:
rpm installation works, execution give segmentation fault
source: can't compile

Version 1.5:
source can't compile

I open a new thread on how to remove the compile errors... I open this
thread on comp.os.linux.development.apps, if anyone has an idea.

Thanks,
Jochen

Okay, the error for compalation was quite easy, found it even myself as a
non-developer...

Now the output of tcptraceroute:

tux:/home/jochen/Software/tcptraceroute-1.5beta6 # ./tcptraceroute
mail.gmx.net 25
Selected device eth0, address 10.0.0.9, port 32929 for outgoing packets
Tracing the path to mail.gmx.net (213.165.64.20) on TCP port 25 (smtp), 30
hops max
1 10.0.0.2 7.750 ms 7.778 ms 7.854 ms
2 bb220-255-138-1.singnet.com.sg (220.255.138.1) 7.988 ms 7.561 ms
7.916 ms
3 202.166.126.201 9.983 ms 9.457 ms 7.959 ms
4 ge-7-0-1-0.guinness.singnet.com.sg (202.166.126.22) 9.949 ms 9.655 ms
7.966 ms
5 ge-0-1-0-3.guinness.singnet.com.sg (202.166.126.37) 9.807 ms 9.417 ms
9.989 ms
6 203.208.145.125 9.828 ms 7.594 ms 9.848 ms
7 so-0-2-0.plapx-cr3.ix.singtel.com (203.208.172.2) 180.035 ms 177.655
ms 186.034 ms
8 ge-3-0-0.plapx-ar1.ix.singtel.com (203.208.168.134) 205.957 ms 201.642
ms 205.995 ms
9 bpr1-ge-4-3-0.PaloAltoPaix.savvis.net (206.24.241.93) 206.055 ms
207.667 ms 212.039 ms
10 dcr1-so-3-3-0.SanFranciscosfo.savvis.net (206.24.211.73) 202.012 ms
201.639 ms 196.086 ms
11 bpr1-so-0-0-0.SanJoseEquinix.savvis.net (208.173.54.65) 215.962 ms
220.198 ms 221.546 ms
12 sl-st20-sj-14-1.sprintlink.net (208.173.54.70) 220.029 ms 211.636 ms
214.029 ms
13 sl-bb21-sj-9-0.sprintlink.net (144.232.9.59) 212.162 ms 215.747 ms
211.979 ms
14 sl-bb24-sj-12-0.sprintlink.net (144.232.3.202) 308.062 ms 199.652 ms
336.094 ms
15 sl-bb21-stk-12-0.sprintlink.net (144.232.20.180) 198.047 ms 195.604 ms
198.060 ms
16 sl-bb26-pen-12-0.sprintlink.net (144.232.20.162) 286.182 ms 286.965 ms
281.949 ms
17 sl-bb27-pen-15-0.sprintlink.net (144.232.16.94) 294.134 ms 289.638 ms
288.039 ms
18 sl-bb21-nyc-2-0.sprintlink.net (144.232.20.96) 280.206 ms 279.666 ms
284.089 ms
19 sl-bb23-nyc-3-0.sprintlink.net (144.232.7.109) 294.088 ms 289.758 ms
296.030 ms
20 sl-bb20-par-11-0.sprintlink.net (144.232.20.44) 365.742 ms 365.823 ms
368.018 ms
21 sl-bb21-fra-13-0.sprintlink.net (213.206.129.66) 408.137 ms 379.649 ms
376.163 ms
22 sl-gw20-fra-1-1.sprintlink.net (217.147.96.227) 372.062 ms 365.626 ms
374.127 ms
23 sle-schlun-2-0.sprintlink.net (217.147.97.58) 362.178 ms 355.678 ms
360.147 ms
24 so-5000.gw-backbone-a.bs.ka.schlund.net (212.227.120.6) 370.051 ms
367.705 ms 370.157 ms
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
Destination not reached

Okay I see that it doesn't go to the destination, but what am I suppose to
do now? Why doesn't it reach the server?

Regards,
Jochen