Zbigniew Szalbot wrote: > Dear all, > > I have been getting smtp timeouts from certain domains (mostly Yahoo) > and I at first I thought I had been blocked as mail to 90% of other > domains is flowing well (gmail, aol, you name it). It took a lot of > time to communicate with Yahoo but they have eventually replied > stating that they are not blocking us. > > But even a simple "telnet a.mx.mail.yahoo.com 25" times out. We have > never had that issue before. If they are not blocking us, what else > could I check to be the cause of networking problems? If it matters, I > can telnet yahoo.co.uk and yahoo.co.cn (or yahoo.cn I don't remember > now) but they seem to be using different MX-s. >
Can you try to make a tcptraceroute on port 25 for the IPs of the yahoo MXes, it may give you a hint on where you are blocked.
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