POP3 and SMTP bridging through Exchange

15 pts.
Tags:
DNS management
Microsoft Exchange 2003
Microsoft Exchange 2007
POP3
SBS 2003 R2
SMTP
This is an out there question and I will be way impressed if anyone can answer it (scroll down to the bottom for the question). Environment and Why I am trying to do what I am: I have a domain that, for the most part, is hosted by Network Solutions. Let’s call it MyDomain.com. MyDomain.com is shared by my extended family members around the country and they use the http web interface for mail (http://mail.mydomain.com, server located at NetSol). This was not good enough for me because I wanted my Hermes to get push mail and stuff, along with putting my local family members at the house on Exchange (SBS Server 2003) and active directory. Pretty straightforward, so far, I obviously used the POP3 connector to bridge about 5 of the 50 emails at NetSol down to my exchange server. Sending SMTP outbound was, of course, a problem, because exchange has no way to relay, by account, each of my five family members emails out to the NetSol server (log on with their individual account info). So I had to configure my local Exchange box to handle relay for local authenticated MyDomain.com accounts. (of course, I also had to switch to a business DSL line because AT&T blocks all non-AT&T port 25 connections from retail accounts). Add clammail to handle the POP3 SSL and was all hunky dory—a hack, but it worked most of the time because my SMTP server IP was recognized on the internet as not being a retail IP and, therefore, less likely to be SPAM. Now, I have moved and have no choice but to have this same infrastructure sit on a cable modem. No big problem there either, though, as I used no-ip.com to dynamically change the DNS pointers for myhomeserver.MyDomain.com as the cable guys gave me new DHCP leases. The PROBLEM BUT, even though the cable company does not filter port 25 traffic, most servers out there don’t like my SMTP connections because they are more suspected of being spam (as a result of my IP belonging to the cable company’s subnet). So 70% of my email is refused if I use my SBS server as the relay. **** as a result, I have to have all outbound SMTP traffic from my AD accounts on SBS Server connect INDIVIDUALLY to their respective accounts back on the NetSol server. QUESTION How do I accomplish this or is there a better solution: Is there a way for each AD account on exchange, for example “MyADUsername”, to make all SMTP mail connect to the server mail.mydomain.com using MyNetSolUserName and MyNetSolPasswoard while another AD account, for example “MyWifesADUsername” makes the SMTP mail connect to the server using MyWifesNetSolUsername and MyWifesNetSolPassword?

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If mail.mydomain.com can act as both POP3 and SMTP, the individual accounts configured on different macnhines can use it without any hassle and can send and receive emails. Even downloading of mails are not required cantrally in this case as you already have a domain and hosted it somewhere (on a server working as a mail server, so this server itself in a way is your server for collecting all incoming mails and pushing it to individual users as and when they login from their individual PCs, laptops)

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  • Thecymbrogi
    that is true. in this case, thought, mail.mydomain.com is not an exchange server and I need some of the functionality of Exchange, such as psuh email, remote wife of pda/phones, etc. The only answer I can think of is a software I came across, PopGrabber. For about 60 bucks it looks like I can download the selected pop3 accounts I need to my local exchange and, when they send through exchange, exchange can route it through PopGrabber which will, on a named account basiss, make the approprotiate authenticated SMTP connection to mail.mydomain.com.....
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  • Abccomputer
    Why not just use the outbound mail server of your ISP for your exchange server (I know many ISPs frown on this), but with all the blacklists putting all the DHCP IPs of the ISPs on their blacklists, it may be the only option. I have a couple of business customers who have ISPs with DHCP for their external IP, and I use the ISPs outgoing mail server. They know I do it, but otherwise much of their mail would be returned as spam. (This is also a smaller ISP)
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  • Jaideep Khanduja
    I also prefer you to use your domain hosting vendor to put your domain on a secured mail server with sufficient space as per your requirement and you use it as POP3 as well as SMTP for receiving and sending your mails from any account, any users, anywhere, without bothering about bringing another server in. this will reduce your hardware cost and lot of botherations.
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  • ChrisCS
    """"most servers out there don’t like my SMTP connections because they are more suspected of being spam (as a result of my IP belonging to the cable company’s subnet). So 70% of my email is refused if I use my SBS server as the relay."""" This happens because a reverse DNS is not set for your domain/ip. Most mail servers do a rDNS check/verify before accepting the message. If it fails it gets rejected. You need to call your ISP & ask them to create a rDNS for you. rDNS = nameofyourserver.domainname.com, update your DNS & point all mail to your server, problem solved. ;) Chris
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