This is something you would configure on your client eg MS Outlook...
for setting up a one-off message receipt when sending a mail go to View\Options and you'll see Tracking...
for always requiring a receipt go to Tools\Options\Preferences\Email\Tracking .
Hi Frank! As you may see from my original question, each firewall uses a different external IP address and I have pointed each firewall port 25 at the Exchange server already.
The problem remains that I am using two NICs because each firewall is on a physically separate LAN - and Exchange...
I need to put our Exchange Server on two LANs so that when one service provider goes down eg BT Opneworld, the Exchange should still be able to take mail from the second ISP, in our case ZEN. So, our first MX record points to one of our public IP addresses and the second record to another - each...
You could do worse than going on to www.sourceforge.org and picking up an SMTP-Mail filter such as Fluffy or ASSP which are basically free. Fluffy relies mainly on DNSBL site lists to block mail whereas ASSP relies on analysing the mail itself... you could use both.
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