RE: blocking annoying 'bounce mail' "feature" from customers use. (Solution, mostly)

2011-06-06 Thread Eric J Esslinger
> -Original Message- > From: Eric J Esslinger [mailto:eesslin...@fpu-tn.com] > Sent: Wednesday, May 25, 2011 11:10 AM > To: 'nanog@nanog.org' > Subject: blocking annoying 'bounce mail' "feature" from customers use. > > > Mac Mail (and others) have a "feature" that allows my > customers to g

Re: blocking annoying 'bounce mail' "feature" from customers use.

2011-05-25 Thread Jeroen Massar
On 2011-May-25 18:09, Eric J Esslinger wrote: [..] > Does anyone know of a way for me to block the following, using > postfix, either via refusing to accept the mail or by dropping it in > /dev/null: Mail from <> or postmaster that originates within our > customer IP blocks/is sent using authentica

Re: blocking annoying 'bounce mail' "feature" from customers use.

2011-05-25 Thread Seth Mattinen
On 5/25/11 9:09 AM, Eric J Esslinger wrote: > Mac Mail (and others) have a "feature" that allows my customers to generate a > fake NDR message and send it back through my server. I get about a customer > every few months that discovers this 'solution' to spam emails, and when it > happens they c