Pamela Saint writes:
"Gordon Messmer" <yiny...@eburg.com> wrote:Pamela Saint wrote:How can I configure Courier to restrict the dispatch from customers (allowable to relay per IP) have set an address of another domain (foo.com), but sent through my server (mydomain.edu)?. SPF, smtp filters, etc. any idea?Your question isn't perfectly clear, but I think you want to restrict what users can put in the From: header of messages that they send. If that's so, then you'll need to use a courierfilter. If you search the list archives, I believe that this has come up before. You may find a courierfilter that is already written which can do what you want.Thanks Gordon. I'm sorry for the lack of clarity.We have a problem with spam in Webmail local service. Outgoing messages have the address of the sender (From header) with anexternal domain for example "otherdomain.com" which is obviously not a domain local call "localdomain.edu. This problem causes the externalmail systems try to block our messages as spam, which is logical.
Set the nochangingfrom configuration file. See man courier.
I need to know which mechanisms to tell Courier that only accepts outbound messages from domains in hosteddomains, local, etc.. It would be like setting smtpaccess by IP addresses, and also by domain of thesender address (From: header "localdomain.edu).
Courier itself has no mechanism to restrict envelope return addresses to a fixed set of domains, however this configuration setting exists to turn off the From: field in webmail, and default it to the login address.
I too am intrigued, if this problem is common in mail systems, as this can be a problem on systems that are configured to allow relay for IP addresses but not using SMTP authentication.
The sender's IP address is recorded in the headers. As such, the sender can be identified from the IP address, irrespective to what the From: header says. After all, even if the sender's address is limited to one of several domains, there's nothing to stop the sender from using any return address in any of the allowable domains.
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