You don't even need to mark the list as moderated. Simply use a shell script to filter all incoming mail, via the .courier mechanism, before running couriermlm.
well, that sounds easy, but I don�t know where to start on that. How would such a script look like? On what criteria should the newsletter author be authenticated? Simple checks against from-address will easiliy be forged, don�t? I am totally blocked on that.
I missed the beginning of this thread, but this sounds like something I was facing myself recently. If there is a real threat of people posting to the list maliciously, then making it moderated is your best protection. However, if you're primarily just worried about blocking random spammers and accidental postings, one of the following two solutions might work for you (credit goes to Sam for much of this; I got some tips from him off-list):
Solution #1. Use a private posting address that only certain people know about. For example, if your list is called [EMAIL PROTECTED], you can make the private posting address [EMAIL PROTECTED] by:
a. Clearing the regular .courier file (make it an empty blank line). b. Creating a file called .courier-privatepost with the following contents:
| unset DTLINE; sed '1,/^$/s/news-privatepost@/news@/ig' | couriermlm msg /path/to/list/dir
(Don't put line breaks in the actual file!)
You will only tell the people you want to be able to post about the address [EMAIL PROTECTED] No-one else will ever see it. Note that this is not foolproof protection, as if someone ever finds out your private posting address, they will be able to post to the list. However, if you choose something hard to guess and only post messages over a secure connection, it's pretty good.
Solution #2. Use a whitelist. This is not as secure as #1, since it can be fooled by a forged From line, but if you don't need tight security, here are the steps:
a. Create a file called .whitelist in the list directory that contains the addresses allowed to post to the list. b. Put the following in the .courier file:
| if grep -i "^\${SENDER:-}$" /path/to/listdir/.whitelist &>/dev/null;
then couriermlm msg /path/to/listdir; fi(Again, no linebreaks in the actual file)
m.
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