On 03/12/12 13:47, Peter Ross wrote:
Hi all,
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).
I have a postfix mail relay (upstream going to the provider) but I cannot see a way of telling it "reject all mails with more than 50 addresses in the header", as an example.
We have a special "list server" to fascilitate legitimate sending to many recipients at the time. It is bypassing this relay - so I don't have to worry about it.
Thanks for answers Peter _______________________________________________ luv-main mailing list luv-main@luv.asn.au http://lists.luv.asn.au/listinfo/luv-main I'm not aware of a way to configure postfix to behave in a non-standard way of dealing with the To: header.
However, theres more than one way to send "bulk" email. If its collating all recipients in the To: header, the mail transport will disburse separate emails for each (rcpt to: ), essentially keeping the body of the email intact including the To: header - don't see many of those anymore. So I wouldn't assume that it would be sent that way. I filter all emails that do not have a properly formated To: header (undisclosed recipients) to users spam box. This blocks a lot of spam but could also block legitimate emails, but no one has complained. Alot of bulk emailers tend to forget about this header. So theirs more than one way to send bulk emails. If hes smart enough to write a script that loops over a list of emails, then you will have some problems. If he has dumped all of your customers email addresses to his own personal list, then your already shit outta luck because gmail would be more than happy to bulk email on his behalf. Perhaps you should've disable his account a few seconds after his threat. Jules.