On Mon, 3 Dec 2012, Peter Ross <Peter.Ross@bogen.in-berlin.de> wrote:
I wonder whether I can prevent outgoing "bulk e-mail".
A disgruntled leaving employee was threatening sending mail to all customers. (It did not happen but management was very unhappy and asked what I could do against it, from the technical side).
From past experience in dealing with all manner of email issues I don't think it's possible to have a system that's usable for all legitimate purposes but which has a rate limit which is small enough that it can't be used for bad purposes. For example imagine if the limit was 3 messages per hour (unreasonably small for business purposes), a bad email sent to the 3 biggest clients would still be a problem. id=R_test_sender ; sender==test@coker.com.au ; recipient!~.*@coker.com.au ; action=REJECT Postfwd is one good way of dealing with this. For example the above config line prevents my test account from sending email outside my domain. That could be used for people who are about to leave the company to allow them to communicate with other employees but not directly with customers. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/