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Telnet 25 port problem

Hi Everybody,

I'm having an issue with qmail and my server to send mails to some domains.
Here is the error. This have been happening for three weeks.

qmail says:
Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)
I'm not going to try again; this message has been in the queue too long.

If I send the e-mail with any other server (even Windows or Linux) it goes
through normally.

I've perform all these tests, and they're all right:

- Resolve MX of the domains.
- Traceroutes to the servers
- Pings to the servers
- Nmap found all the ports that must be open, particularly the 25.
- I've talked to the network administrators of the domains that I can't
reach and they've told me that there is no block for my IP address
(firewalls, blacklists, etc.)

The only BIG PROBLEM is that I cannot make "telnet (mailserver) 25". It ends
in a time out after a minute. I've also talked with my ISP, and It's not a
routing problem. If it was a routing problem, I couldn't reach the domains
with any other servers of my subnet... (that already happened to me).

These are some of the mail servers that I can't reach with my Debian:
mail.matrocolayasoc.com.ar, mail.skytel.com.ar, mail.ecogas.com.ar, and

I'm running a Linux version 2.4.20-pre8 (gcc version 2.95.4 20011002 (Debian

I appreciate any comment.

Yours Sincerely,


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