On Thu, 2003-11-13 at 10:26, Michael Holt wrote: > On Thu, 2003-11-13 at 06:51, Jack Coates wrote: > > > Cisco routers are actually very dumb. If the router or a regular > > firewall is blocking the mail, then the three way TCP handshake will > > never complete. If a proxy-using firewall (Raptor or the so-called > > "security servers" in PIX and Check Point (so-called because the number > > one source of security holes on those firewalls)) is in use, it will > > accept enough headers to make a decision on. > > > > Dropping the connection right after 220 for servers that aren't on any > > BL is broken behavior. > > Ok, in reading the rfc 2821, I come to these relevant lines: > > "The SMTP client MUST, if possible, ensure that the domain parameter to > the EHLO command is a valid principal host name (not a CNAME or MX name) > for its host. If this is not possible (e.g., when the client's address > is dynamically assigned and the client does not have an obvious name), > an address literal SHOULD be substituted for the domain name and > supplemental information provided that will assist in identifying the > client." > > In my original post, I included my headers. They show that the webmail > header came with my verizon dsl id: > > Received: from www.holt-tech.net (unknown > [server.internal.ip.address]) by servername (Postfix) with SMTP id > 13833205CFC for <[EMAIL PROTECTED]>; Wed, 12 Nov 2003 15:16:15 -0500 > (EST) > Received: from evrtwa1-ar17-4-35-151-34.evrtwa1.dsl-verizon.net > ([4.35.151.34]) (SquirrelMail authenticated user michael) by > server.internal.ip.address with HTTP; Wed, 12 Nov 2003 12:16:15 -0800 > (PST) > > Notice the second "received" line "evrtwa1-blah-blah". Could that > string be what allows me to connect to their server? Short of that, I'm > at a loss as to what else could be dropping me. When I use the client > machines, that line becomes whatever machine name I'm at along with it's > internal ip.
that could be it, but you'll have to use ethereal or tcpdump or something to watch the session and see if you're even able to send a EHLO/HELO statement; I was never able to get that far. -- Jack Coates Monkeynoodle: A Scientific Venture...
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