Re: Testing Valid Recipients for outbound spam filtering

2013-05-01 Thread Marc Perkel
On 5/1/2013 12:12 AM, Robert Schetterer wrote: Am 01.05.2013 08:17, schrieb Marc Perkel: Looking for tricks. I'm working on improving outbound spam filtering and I'm using Exim and testing for valid recipients doing forward recipient callouts, which I would like to reduce. I'

Re: Testing Valid Recipients for outbound spam filtering

2013-05-01 Thread David F. Skoll
On Tue, 30 Apr 2013 23:17:42 -0700 Marc Perkel wrote: > Or - open to any suggestions on blocking outbound spam. (I'm > filtering outbound for customers so I don't control the original > servers) We use quarantining (although at a higher score than for inbound mail) and rate-limiting (a given sen

Re: Testing Valid Recipients for outbound spam filtering

2013-05-01 Thread Robert Schetterer
Am 01.05.2013 08:17, schrieb Marc Perkel: > Looking for tricks. > > I'm working on improving outbound spam filtering and I'm using Exim and > testing for valid recipients doing forward recipient callouts, which I > would like to reduce. > > I'm wondering if

Re: Testing Valid Recipients for outbound spam filtering

2013-04-30 Thread Benny Pedersen
Marc Perkel skrev den 2013-05-01 08:17: Or - open to any suggestions on blocking outbound spam. (I'm filtering outbound for customers so I don't control the original servers) block sender domains with spf that try to send from the incorrect ip, pypolicyd-spf rooks there, just remember not to

Testing Valid Recipients for outbound spam filtering

2013-04-30 Thread Marc Perkel
Looking for tricks. I'm working on improving outbound spam filtering and I'm using Exim and testing for valid recipients doing forward recipient callouts, which I would like to reduce. I'm wondering if there's any tricks to figure out at least some bad domains or reci

Re: Outbound spam filtering for a large ISP

2007-09-05 Thread Kris Deugau
Peter Mikeska (MiKi) wrote: here are my 2 cents ;) I'm not Joe, but I have to disagree with some of your points. no word about MTA, from other answers its look like sendmail. for high volume and this kind of things there is something fast and relatively easy ;) Umm... no. Switching MTAs

Re: Outbound spam filtering for a large ISP

2007-09-05 Thread Peter Mikeska (MiKi)
Hello Joe, here are my 2 cents ;) Sunday, September 2, 2007, 9:28:55 PM, you wrote: > Hello, > I maintain a large webmail host (I bet you can figure out which one) for > free/paid accounts that sends out tens of thousands of emails a day. We're > not quite Yahoo Mail or Hotmail, but we're prett

Re: Outbound spam filtering for a large ISP

2007-09-04 Thread Ken A
Joe Pranevich wrote: Hello, I maintain a large webmail host (I bet you can figure out which one) for free/paid accounts that sends out tens of thousands of emails a day. We're not quite Yahoo Mail or Hotmail, but we're pretty big. We're looking to scan outbound mail using SpamAssassin and I'm ho

Re: Outbound spam filtering for a large ISP

2007-09-04 Thread Kelson
Leon Kolchinsky wrote: Try amavisd-new list. There you could integrate your SA checks in a very efficient way (policy banks, quarantining, releasing etc.) MySQL backend is also a good idea on high load severs. I'd also recommend MIMEDefang for integrating SpamAssassin into sendmail. It's a m

RE: Outbound spam filtering for a large ISP

2007-09-03 Thread Leon Kolchinsky
> Hello, > > I maintain a large webmail host (I bet you can figure out which one) for > free/paid accounts that sends out tens of thousands of emails a day. We're > not quite Yahoo Mail or Hotmail, but we're pretty big. We're looking to > scan > outbound mail using SpamAssassin and I'm hoping that

Re: Outbound spam filtering for a large ISP

2007-09-02 Thread Loren Wilton
I'm using. But, maybe with some Bayesian work... it would be possible. But, as I said, I'm a bit risk averse and Bayesian poisoning is so easy, especially at this volume. I would turn off AWL I think in your situation. But by and large Bayes poisioning is a myth, at least for the vast majorit

Re: Outbound spam filtering for a large ISP

2007-09-02 Thread SM
At 12:28 02-09-2007, Joe Pranevich wrote: I maintain a large webmail host (I bet you can figure out which one) for free/paid accounts that sends out tens of thousands of emails a day. We're not quite Yahoo Mail or Hotmail, but we're pretty big. We're looking to scan outbound mail using SpamAssass

Re: Outbound spam filtering for a large ISP

2007-09-02 Thread Joe Pranevich
d be possible. But, as I said, I'm a bit risk averse and Bayesian poisoning is so easy, especially at this volume. Thanks for your feedback. I wasn't aware of the report_safe option, but that's a good call too. Joe -- View this message in context: http://www.nabble.com/Outbound-sp

Re: Outbound spam filtering for a large ISP

2007-09-02 Thread Loren Wilton
My plan is to scan all outbound mail and drop all mails that match to a log file or a separate directory where they can be hand-reviewed by someone in our customer service department. We also wouldn't want to actually modify the mails on the way out-- so we wouldn't add the spamassassin mail hea

Outbound spam filtering for a large ISP

2007-09-02 Thread Joe Pranevich
for any help you can provide. Joe -- View this message in context: http://www.nabble.com/Outbound-spam-filtering-for-a-large-ISP-tf4368897.html#a12452483 Sent from the SpamAssassin - Users mailing list archive at Nabble.com.

Outbound spam filtering

2006-01-19 Thread Don O'Neil
Anyone have any pointers on setting up an outbound MTA spam filter with qmail? I have spamassassin working on inbound, but want to prevent/block users from sending spam. Thanks!