Hi. It is not uncommon for ISP's to reroute all connections to port 25 to a local mailserver. It is usually achieved with a rule in ISP's router/firewall. It is especially useful to stop users sending spam as (among other things) it can limit the number of recipients etc.
If a telnet connection to 'your.mailserver.com 25' connects to 'their.mailserver.com 25' then this is what is happening and it may (or may not) be possible for the other ISP to stop it. Thanks Phil > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Matt Robertson > Sent: 22 March 2004 16:47 > To: [EMAIL PROTECTED] > Subject: [IMail Forum] Imail blamed in ISP switch.[Scanned] > > First off let me say I know perfectly well the other party is > flat out lying to us. I know they're screwed up but I don't > have the NOC background to tell them exactly how... > > I recently acquired a customer who I have set up with a web > site and Imail service. Fine and dandy. The former mail and > web ISP is also their DSL provider, so their access remains > on this network. > > Only problem is that, from their own network in their office > (i.e. using the former provider's dsl service), when sending > mail it still comes thru via the old provider's mail > server... Not the new one. > > Opening a cmd window from their office, the mail server > domain pings to the new mail server IP just fine. However if > you actually send the mail using mail.domain.com it gets > routed thru the ISP's network (qhich happens to use qmail). > > >From any other network the mail service behaves as expected. The ISP > first told the client that they needed to 'flush their > cache'. On Outlook. Then they said it was a problem with > Imail. Horse pucky, I say. > > I saw this happen once before, years ago, and the ISP told me > that they had sort of a 'local domains' list that hadn't been > adjusted. That was in 1997 so there's no way I can remember > well enough to repeat that with any level of authority. > > Can anyone out there who's familiar with network ISP ops shed > any light on what the cause of this is? > > -------------------------------------------- > Matt Robertson [EMAIL PROTECTED] > MSB Designs, Inc. http://mysecretbase.com > -------------------------------------------- > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: > http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > --- CONFIDENTIALITY NOTICE: This Email is confidential and may also be privileged. If you are not the intended recipient, please notify the sender ([EMAIL PROTECTED]) IMMEDIATELY; you should not copy the email or use it for any purpose or disclose its contents to any other person. GENERAL STATEMENT: Any statements made, or intentions expressed in this communication may not necessarily reflect the view of the Company. Be advised that no content herein may be held binding upon the Company or any associated company unless confirmed by the issuance of a formal contractual document or Purchase Order. Any Prices quoted are valid for ONE Business day only. Calls to LAN Systems may be recorded for quality assurance and training purposes. If you would like any information on the products and services offered by Lan Systems, please visit our web site http://www.lansystems.co.uk E&OE To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
