>We are having troubles sending mails to an specific domain.
That is a common problem. :)
>If I ping the domain (ping domain.com.ar) it answers its IP address.
That doesn't really matter, because the ping will usually go to a different
IP than the mailserver.
>when I ping -a that IP address, the answer comes from other site (a big
>ISP�s router) .
The -a just shows you the name of the computer you are pinging.
>If I tracert this IP or the domain I arrive to the router.
Again, this doesn't help much, as that will usually lead you to their
webserver.
You need to look up the MX record for their domain to determine what
machine to ping (or telnet to, since many people now think that ping is
dangerous for some reason and block it).
> However, they can receive mails from everywhere but from us, and we can
> send mails everywhere but them. Our provider says everithing is Ok. The
> same theirs. any idea?
If you let us know the domain, we can help. Most likely there is a problem
on their end, such as an MX record that doesn't have a hostname (using an
IP or something else instead that doesn't belong).
-Scott
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