I dont believe it is a router issue. They could have a acl in place but then you wouldnt see the answer from the server it would just block it alltogther. I dont remember ever seing a Cisco router checking the header files in emails to block a person. I think they may have a timeout issue like mentioned before. They may be trying to prevent anyone from trying to run a script to get in there box through there email server software. This is the first time I have seen an email server not respond the correct way using telent to port 25.
In any case it seems to be there problem. I would contact there sys admin and see whats up with this issue. Please let us know what the answer is if you get one. On Star Date Wednesday 12 November 2003 09:16 pm, Michael Holt sent this sub-space message. > > > > Except they drop connection before he could ever send From.. Maybe > > they've set a ridiculously low timeout or something, but it doesn't act > > like any real world mailserver I've ever seen. > > See, that's the thing. I haven't done any playing with cisco routers, > but I would imagine that the ios is smart enough to drop anything except > an email packet at port 25 and then with all the recent problems with > ddos attacks and virii, etc, I would think that they *would* want to > seriously filter the headers that come in. But you guys are saying that > the headers on my email - no matter which machine I'm sending from - are > absolutely normal? Nobody would or could do it differently? >
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