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Both Exchange delivered directly and Pop3 connector

dingir
dingir asked
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Last Modified: 2008-01-09
Hi! Is it possible for me to use pop3 connector and hav exchange delivered mail directly?

I use pop3 connector today and have smtp/pop3 ports (inbound) closed on the firewall. Our ISP has offer us to point a first MX record to our static (public) ip and use thier own as second. Therefore all mails will be delivered to them, if our server is down in any reason.

I want to have pop3 connector still downloading mails from there pop3 accounts even though mail going directly to our Exchange Server. This would work like a fail over. If our system (or Internetline) is going down, then our ISP's mailserver is picking up the mail, for our POP3 connector to download instead.

Is this possible? Can I on any way try to e-mail our Exchangeserver directly and get that mail delivered to corresponding mailbox without stopping anything who works today? Like e-mailen name.name@ourpublicipadress or something? I've tried but it doesn't deliver.. (port 25 is open inbound)
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Principal Consultant
CERTIFIED EXPERT
Most Valuable Expert 2016
Top Expert 2014
Commented:
Yes, it is possible... however, you should understand that unless your server is down for an extended period (like more than 48 hours) email messages would be held at the sending server until your SBS back on line and would then be delivered to you.  

If you were to configure your ISP's server as a backup... you should only use a catch-all account there, and let the POP3 Connector and Exchange parse out the messages to the appropriate users.  Otherwise, the POP3 Connector will be using up resources on your server by continually checking multiple POP3 accounts unnecessarily.

The way to convert from POP3 to SMTP mail using Exchange is quite easy and would not cause any interruption of your current business.  Please see http://sbsurl.com/pop2smtp for an overview of the steps, most of which you've already done.

When you run the Configure Email and Internet Connection Wizard (CEICW -- which is linked as Connect to the Internet in the Server Management Console > Internet and Email) you will select BOTH the Microsoft Connector for POP3 and Exchange for email retreival.  You can then set your new catch-all account as the POP3 mailbox to retreive from.

A visual how-to is here:  http://sbsurl.com/ceicw and a full networking overview for SBS is at http://sbsurl.com/msicw

Within that wizard you'll see a "more information" button on each screen that has invaluable help in deciding which options to select.  
Be sure to check those out as well.

Jeff
TechSoEasy

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Commented:
Hi Tech! Thank's for answer.

As I thought, but it beter to ask to be sure. It's often gives some nice extra info to think about - and of course always nice to speak :-). Is there a way to try that the connection to SMTP is working from outside, without first changing the mx record? Like e-mailing mailboxname@ipnumber? I've tried THAT but got a "cannot route to that mailbox" as return answer. Of course, our Exchange are configured to handle the single domain "company.com". I've tried to telnet port 25, it's fine so far.
Jeffrey Kane - TechSoEasyPrincipal Consultant
CERTIFIED EXPERT
Most Valuable Expert 2016
Top Expert 2014

Commented:
You cannot email to an IP address, that won't work.

You can test your SMTP service by following this KB article:  http://support.microsoft.com/kb/153119

Then, you can check your MX record resolution by using www.mxtoolbox.com

Jeff
TechSoEasy
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