http://www.dslreports.com/forum/telus Telus forum current topics en Copyright 2007, dslreports.com Sat, 11 Oct 2008 01:01:00 EDT Sat, 11 Oct 2008 01:01:00 EDT http://i.dslr.net/bbrdisc1.gif http://www.dslreports.com 19 18 bbr disc http://www.dslreports.com/forum/remark,21226497 http://www.dslreports.com/forum/remark,21226497 2008-10-06 23:35:26 http://www.dslreports.com/forum/remark,21207064 http://www.dslreports.com/forum/remark,21207064 2008-10-02 21:16:49 http://www.dslreports.com/forum/remark,21242666 http://www.dslreports.com/forum/remark,21242666 2008-10-09 19:53:51 http://www.dslreports.com/forum/remark,21243635 http://www.dslreports.com/forum/remark,21243635 2008-10-09 22:46:52 http://www.dslreports.com/forum/remark,21244097 http://www.dslreports.com/forum/remark,21244097 2008-10-10 01:11:44 http://www.dslreports.com/forum/remark,21243290 theircompany.com - DNS A record resolves to theoretical IP of 10.0.0.0 > theircompany.com - one DNS MX record which points back to theircompany.com > Theoretical IP of 10.0.0.1 is their WAN IP of a router. > The router then forwards port 25 to their internal exchange server of (lets call it 10.0.0.2). > Users then connect to the exchange server using Outlook 2003. So to simplify further... theircompany.com (resolves 10.0.0.1), router forwards to 10.0.0.2. Pretty straight forward way of receiving email, right? Every single time I test sending from my email (separate server) to one of their accounts, everything goes through fine. No issues whatsoever. And this is the case most of the time. But the problem is with how many senders cannot reach them, and I'm at a loss for fixing it. I have however noticed a pattern developing though. It seems like senders sending through Telus never make it through. For example, if I use telnet directly to my own smtp server, mail from: me@myownserver.com, rcpt to: so_and_so@theircompany.com, the message makes it through. However, and here's the kicker... If I telnet to smtp.telus.net, mail from: (myowntelusaccount@telus.net) and rcpt to: so_and_so@theircompany.com, I receive back an error message from Telus SMTP of "Recipient address rejected: User unknown". My own Telus webmail also reports "Invalid Email Address" if I attempt sending to anybody at theircompany.com. Thus, it almost seems like Telus thinks theircompany.com is internal to Telus, so it refuses to route it to it's true location resolved by their registrar, hence why it thinks the user doesn't exist. I've even had a packet sniffer running on port 25 on their WAN connection which never even sees my incoming mail attempt from Telus, however it sees all other incoming mail. Because of this, I am 100% positive the problem is not with their router, internal network, nor server. To further my suspicion, it turns out that 2 years ago, this client had their domain with Telus as their registrar AND email host. They accessed it at that time via POP. So then, 2 years ago, when they got their new Exchange server put in, the domain name was transferred to a new registrar, and the domain was then set to resolve to their WAN IP. Everything seemed perfect, or so we thought. Apparently ever since that switch over 2 years ago, the client has indeed had incoming emails go missing sporadically. So are you thinking what I'm thinking? It's almost like Telus SMTP servers get messed up on routing to theircompany.com because it thinks theircompany.com is still hosting with Telus when it isn't. This is as far as I've gotten. And now, I'm at a loss for how to fix this. I can't tell every sender who has problems to redirect all of their outgoing mail around Telus SMTP servers. The client no longer has a login nor account ID for their old domain/hosting plan, so how do I troubleshoot it myself? I'm planning to call Telus tomorrow, but I'm not looking forward to it. They'll probably tell me to reboot my computer as a fix. I need access to some sort of high up network support people that can comprehend the situation. But even then, if the client is no longer with Telus, how much help can they really provide? Are there some other Telus tech numbers I can call beside 310-TECH? Has anybody else heard of issues like this? Is there something within Telus mail routing that interferes in this way? Is there anything I can do about it? And lastly, am I on the right track with this, or can somebody suggest another possible reason for the missing incoming email? Keep in mind the packet sniffer did NOT see any connection attempt when sending with smtp.telus.net as an outgoing server. Helllllpppppp!!!]]> http://www.dslreports.com/forum/remark,21243290 2008-10-09 21:37:26 http://www.dslreports.com/forum/remark,21210217 http://www.dslreports.com/forum/remark,21210217 2008-10-03 12:21:12 http://www.dslreports.com/forum/remark,21211094 http://www.dslreports.com/forum/remark,21211094 2008-10-03 15:09:40 http://www.dslreports.com/forum/remark,21227006 http://www.dslreports.com/forum/remark,21227006 2008-10-07 02:24:54