The loop discussion came from my suggestion, which was to add a second domain to the POP3 accounts and forward a copy there out of Exchange. There isn't a way to do THAT without causing a mail loop.
Instead, if you take the POP3 server out of the picture for your public MX routing, you can register a second domain to the POP3 host and forward a copy of everything from Exchange to [EMAIL PROTECTED] Internet mail will go straight to Exchange, internal coworker email will go straight to Exchange, and Exchange will maintain a "second copy" on the ISP's mail server. If they decide they don't like Exchange, all you have to do is change your MX records to route through the ISP again. --James -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett Fernicola Sent: Wednesday, November 14, 2007 7:30 AM To: Exchange Discussions Subject: RE: Exchange advanced SMTP Configuration ? I think you guys are missing the point, there is no loop or problem. First I don't care about the ISP Linux Pop3 server, its not my problem. Let me brake it down again... Lets call the small company books.com, books.com pays a 3rd party webhost a small fee for webhosting dns, and 30 pop3 mail accounts. The current users of this company all use pop3 to connect to the linux host to get their email. All is well here. Ok now the users of the company are interested in exchange. They have a small network with a domain controller, file servers etc. They also have an extra box which I installed exchange on. They have a semi decent static internet connection which I registered etc. There internal domain name is contoso.local. Now on the 3rd party webhosting admin panel each users pop3 email account is setup to forward a copy of all new incoming email to [EMAIL PROTECTED] this feature is working 100%. Now what I want to achieve. By adding the external live smtp address for each user in AD, ex. [EMAIL PROTECTED] the users at the company can log into exchange and send email; by setting the 2nd smtp address "@books.com" as primary, the recipients of those emails see @books.com as the sender. If the recipient emails [EMAIL PROTECTED] back the email will go to the Linux Pop3 server "again not under my control or problem" and once the email gets there it will be forwarded to [EMAIL PROTECTED] There the email will get to the proper exchange account etc. So now we have a copy of the email in 2 places. On the linux host and on their exchange server. The only problem I have is this. Using this setup if a user logs into exchange on the lan and sends an email to another co-worker using the real external domain, @books.com, so lets say [EMAIL PROTECTED] emails [EMAIL PROTECTED] using their exchange profile, then the email will not go out to the internet, instead it gives delivered instantly to their mailbox via exchange. I can not have this right now. I need exchange to not deliver mail going to the domain @books.com to its local storage group. Instead I need it to strictly use a Smart Host or something to force exchange to send the email out to the internet where it will reach the Linux Pop3 server only. Now once that email reaches the linux pop3 server it will be forwared to [EMAIL PROTECTED] Thus no duplicate emails, one exchange server not doing that much work, and the linux server I don't care one bit about. So now if exchange fails or they do not like it, they can switch Outlook profiles and fall back to their Linux Pop3 account, where low and behold an exact copy of %100 of their email will be sitting waiting for them. I know this can be done, its got to be very similar to when one company purchases another company and they start a merger. Please any real help is appreciated this setup has to work as described. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dean Cunningham Sent: Tuesday, November 13, 2007 8:52 PM To: Exchange Discussions Subject: RE: Exchange advanced SMTP Configuration ? Probably agree with your comment on your last line :-) Journalling may be another option, or perhaps each excahnge mailbox has an alternate recipient that is a mailbox on the linux server?? Would not cached outlook give them similar feature to what they have now? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett Fernicola Sent: Wednesday, 14 November 2007 06:35 To: Exchange Discussions Subject: RE: Exchange advanced SMTP Configuration ? The copy of email on the pop3 linux host is for backup and failsafe purposes, these users right now do not want to switch to exchange because they fear failure is destined on the exchange server. They want to be able to fall back to the hosting provider they already pay for incase exchange goes down. They also do not have an exchange admin, but they do have the hardware and bandwidth in place. Since the pop3 is so cheap they don't mind paying them for this type of backup and service until they feel they can manage exchange. However they are interested in exchange because they want to be able to share calendars and inbox's etc, which means using exchange. So what will happen right now with the current setup is their pop3 and exchange accounts will all have the same exact email except for any emails sent from outlook via exchange to another user in the company. This mail sees the smtp address in AD and sends the mail to the storage group. So if exchange fails and they have to temporarily switch profiles to pop3 they will be missing all the emails the users sent to each other. Can anyone think of any solution to this problem, or am I nuts for even trying. ********************************************************************** Have you clicked on yet? www.nrc.govt.nz ********************************************************************** NORTHLAND REGIONAL COUNCIL This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. 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