[Mailman-Users] Make sure that only our newsletter can be delivered to a mailing-list that is not moderated

[Jacob Friis Larsen]

>> We will use Mailman to send our newsletter.
>> This newsletter will be sent from the same server every time.
>> The mailing-list will not be moderated, as the newsletter will be sent
>> automatically by a script, sometimes in the weekend where no staff is at
>> work.
>>
>> How can we secure our list server?
> 
> Just add all the necessary addresses to the list of addresses that are 
> allowed to post to the list. Moderate all other senders.

Wouldn't it be too easy for someone to change their sender address and 
get their spam out to our customers?

Thanks,
Jacob