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Exchange SMTP problems...

By jedavidow ·
We are trying to control access to our E2K SMTP server.

Right now we are set to accept both Anonymous and
Basic authentication. but this means that anyone can send email thru our server.

So I unchecked the Anonymous access. But after a fewminutes we can no longer RECEIVE email (although send still works).

Why is this happening?

Jed

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Exchange SMTP problems...

by fchadney In reply to Exchange SMTP problems...

To control Relaying, leave anonymous authentication checked, but on the Relay button (Access screen) clear the "Allow all computer with successfully authenticate....." otherwise anonymous connections can relay too. This is good if you don't need anyone on the outside to relay... but if you do, you can add their IP address(s), subnet or domain name (<<<REQUIRES reverse DNS) and they will be allow to relay.


Regards,

Faren Chadney

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Exchange SMTP problems...

by jedavidow In reply to Exchange SMTP problems...

Sorry, #2 gets the points.

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Exchange SMTP problems...

by R. A. Caluste In reply to Exchange SMTP problems...

Create two SMTP virtual servers, the first one is bounded to your EXTERNAL ip address. Relaying is disabled and no external DNS is configured. The second one is bounded to your INTERNAL ip address. Relaying is enabled and external DNS is configured.

What this does is basically allowing people from within your organization to access SMTP (because relay and external dns is configured for your smtp virtual server on internal ip address only). Those from outside cannot use your SMTP to relay, it can only receive emails addressed to people within your organization.

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Exchange SMTP problems...

by jedavidow In reply to Exchange SMTP problems...
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Exchange SMTP problems...

by adeal In reply to Exchange SMTP problems...

Hi Jed. Andrew here.

Answer #2 is also what we're doing here, with one exra step. Inbound gets translated from port 25 to 10025 at the firewall, so the inbound SMTP is also on that port. Come by some time if you want to take a look at the company's setup

Don't give me the points though. #2 deserves credit for it.

For those of you who wonder why your questions aren't getting answered, a blacklist was created to track those who always ask, but never reward or respond - despite valid answers being presented.

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Exchange SMTP problems...

by jedavidow In reply to Exchange SMTP problems...
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Exchange SMTP problems...

by jedavidow In reply to Exchange SMTP problems...

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