Hi list - calling all IIS experts!
I'm learning as I go with server configuration so bear with me while I
stumble through my explanations and problems.
I'm having a bit of a pickle configuring my SMTP server to do what I want it
to do. My SMTP server must serve 2 roles:
. to receive e-mail from anybody sending mail to our addresses
. to act as a mail relay for a specific authorised login, irrespective of
its location or computer (it's from a CD-ROM project we're going to be
distributing soon)
I can get either one of these functions working but I cannot configure the
server to achieve both at once.
To receive e-mails from anybody, I allow anonymous access (set under Access
Control in the Access tab) from all connections ("all except the list below"
with an empty list, set under Connection Control in the Access tab). This,
to my limited understanding, allows any mail server to connect to mine and
transfer data. This works fine.
To act as a relay I allow access through the Windows security package *only*
(set under Access Control in the Access tab) and blanket-block all locations
("only the list below" with an empty list), but allow all successfully
authenticating computers to relay (set under Relay Restrictions in the
Access tab). This also works fine.
The problem I now have is doing one of these things messes around the other.
Originally I used both anonymous access and Windows authentication, with all
successfully authenticated computers allowed to relay, but I realised
quickly that opened a huge security hole as an anonymous login would count
as a successful authentication. 35 seconds later I was used as a relay for
17,000 spam e-mails.
I then turned off anonymous access and although the relay still worked fine
using the authenticated user account from any connection, every other e-mail
sent to our addresses bounced "sender was rejected: client was not
authenticated".
I've gone through all the settings in the configuration and I cannot see
what combination of settings will do what I want. As I want to receive
e-mail from any computer I can't set an authorised or blocked computer list
as this list will change all the time, however I can't seem to restrict
relaying to a specific user account but allow connections from anywhere.
So, in a nutshell, sombody save me and tell me what to do!
Clear as mud? Thought so
MOU
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