Who is blocking my smtp connection

Hi,

I get "connection time out" error to all the major email sites' smtp port.
E.g.,

telnet mx4.mail.yahoo.com smtp
telnet mx2.mail.yahoo.com smtp

or hotmail/gmail.

whereas normal telnet (to normal telent sites) can go through.

I'm suspecting that my ISP is blocking all its clients' smtp connection.
How can I prove that?

I want to find it out myself before calling them up, 'cause I suspect that
my ISP's helpdesk knows what an smtp port is.

thanks

--
Tong (remove underscore(s) to reply)
*niX Power Tools Project: http://xpt.sourceforge.net/
- All free contribution & collection

"* Tong *" <(E-Mail Removed)> wrote in message
news(E-Mail Removed) rge.net

> I'm suspecting that my ISP is blocking all its clients' smtp
> connection. How can I prove that?

Read your TOS (Terms of Service) to see if it prohibits you from operating
any specific services such as a web site or SMTP MTA (Mail Transport Agent),
then use " tcptraceroute mx4.mail.yahoo.com 25 " or some such to see where
the traffic gets blocked. Most likely it will be at an address within your
ISP's control.

* Tong * wrote:

> I'm suspecting that my ISP is blocking all its clients' smtp connection.

Many ISPs are blocking off net SMTP servers, to reduce spam. Some ISPs
provide another port that can be used or secure access.

On Sun, 23 Oct 2005 19:05:14 -0400, * Tong * wrote:

> Hi,
>
> I get "connection time out" error to all the major email sites' smtp port.
> E.g.,
>
> telnet mx4.mail.yahoo.com smtp
> telnet mx2.mail.yahoo.com smtp
>
> or hotmail/gmail.
>
> whereas normal telnet (to normal telent sites) can go through.
>
> I'm suspecting that my ISP is blocking all its clients' smtp connection.
> How can I prove that?
>
> I want to find it out myself before calling them up, 'cause I suspect that
> my ISP's helpdesk knows what an smtp port is.
>
> thanks

[sourcecode@localhost:~]$\ [01:16:44] telnet mx4.mail.yahoo.com smtp
Trying 68.142.202.11...
Connected to mx4.mail.yahoo.com.
Escape character is '^]'.
220 mta200.mail.mud.yahoo.com ESMTP YSmtp service ready

--------


The Servers are up, maybe some Firewall from your Pc is Blocking you?

Just contact your ISP and ASK if there are blocking the SMTP Port (
Technical Support )


--
MFG

Christian Fuß,
replica-solutions.de

* Tong * wrote:

> I get "connection time out" error to all the major email sites' smtp port.
> E.g.,
>
> telnet mx4.mail.yahoo.com smtp
> telnet mx2.mail.yahoo.com smtp
>
> or hotmail/gmail.

Rogers block outgoing port 25 traffic:
http://www.digitalhomecanada.com/for...p/t-26854.html

Reconfigure your SMTP server to relay through Rogers' SMTP (aka smarthost).

"Snowbat" <(E-Mail Removed)> wrote in message
news:1130119868.943ea939083da8c80a62a50b167baf3a@t eranews...

> Rogers block outgoing port 25 traffic:
> http://www.digitalhomecanada.com/for...p/t-26854.html
>
> Reconfigure your SMTP server to relay through Rogers' SMTP (aka
> smarthost).

Unless, of course, there are sites that have specifically authorized you
to pass mail through them, in which case ask them what to do. They'll give
you a different port to use.

DS

On Sun, 23 Oct 2005 19:22:38 -0700, David Schwartz <(E-Mail Removed)> wrote:
|
| "Snowbat" <(E-Mail Removed)> wrote in message
| news:1130119868.943ea939083da8c80a62a50b167baf3a@t eranews...
|
|> Rogers block outgoing port 25 traffic:
|> http://www.digitalhomecanada.com/for...p/t-26854.html
|>
|> Reconfigure your SMTP server to relay through Rogers' SMTP (aka
|> smarthost).
|
| Unless, of course, there are sites that have specifically authorized you
| to pass mail through them, in which case ask them what to do. They'll give
| you a different port to use.


'tcptraceroute' will let you do a traceoute using a specified TCP port
(like port 25 for SMTP). This will tell you what server/router is blocking
the connections.

This may not be installed by default on your distribution, you might need
to search a bit for it.


--
Reverend Paul Colquhoun, ULC. http://andor.dropbear.id.au/~paulcol
Asking for technical help in newsgroups? Read this first:
http://catb.org/~esr/faqs/smart-questions.html#intro

> telnet mx4.mail.yahoo.com smtp
> or hotmail/gmail.


well, for gmail, try this ... (edited for brevity)

# openssl s_client -connect smtp.gmail.com:465

CONNECTED(00000003)
depth=0 /C=US/ST=California/L=Mountain View/O=Google
Inc/CN=smtp.gmail.com
---
Certificate chain
0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=smtp.gmail.com
---
Server certificate
-----BEGIN CERTIFICATE-----
-----
New, TLSv1/SSLv3, Cipher is DES-CBC3-SHA
Server public key is 2048 bit
SSL-Session:
Protocol : TLSv1
Cipher : DES-CBC3-SHA
Session-ID:
6597C02593BEA13BC4A3EA0CF692E5803034FAD080C6287332 D4986DB8B0B20E
Session-ID-ctx:
Master-Key:
F2E23E906DA0C693625AB52AD40A66649FAFC4C6F11B3819E6 561390B0BFBA16091A9E58D5F80D8BAC398EFCE48896E7
Key-Arg : None
Start Time: 1100699679
Timeout : 300 (sec)
Verify return code: 21 (unable to verify the first certificate)
---
220 smtp.gmail.com ESMTP v71sm1679cwb
EHLO slackserv
250-smtp.gmail.com at your service


--
Raqueeb Hassan
Bangladesh