Re: Fake amavisd-new header lines in recent spam

2014-11-10 Thread Axb
On 11/10/2014 09:01 AM, Rich Wales wrote: /do we have your permission to add this rule to SA's masscheck / autopromoting ?/ Yes, by all means, go ahead. Thanks, Commited to http://svn.apache.org/repos/asf/spamassassin/trunk/rulesrc/sandbox/emailed/sa_users_contrib.cf masscheck results w

Re: Fake amavisd-new header lines in recent spam

2014-11-10 Thread Rich Wales
> /do we have your permission to add this rule to SA's masscheck / > autopromoting ?/ Yes, by all means, go ahead. -- *Rich Wales* ri...@richw.org

Re: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Axb
On 11/10/2014 02:32 AM, Rich Wales wrote: This *AXB_XRCVD_8B8* rule seems excessively broad to me. It seems it could wrongly catch e-mail that was legitimately Amavis-scanned on its way out by a server whose name just happened to be eight characters long. I think a better rule would take advant

Re: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Rich Wales
This *AXB_XRCVD_8B8* rule seems excessively broad to me. It seems it could wrongly catch e-mail that was legitimately Amavis-scanned on its way out by a server whose name just happened to be eight characters long. I think a better rule would take advantage of other anomalies with these fake heade

RE: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Marieke Janssen
>Yeah they tried a similar trick with MailScanner years ago, basically dont >trust someone elses mail to tell the truth as per usual You are right about trust, but in this case we can detect fake amavis-headers and score bigtime in a safe way. And from what I can tell from my logs it hits

Re: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Martin Hepworth
Yeah they tried a similar trick with MailScanner years ago, basically dont trust someone elses mail to tell the truth as per usual On Sunday, 9 November 2014, Marieke Janssen wrote: > >hitting like crazy and safe > > Confirmed, thank you. > > /MJ > > -- -- Martin Hepworth, CISSP Oxford, UK

RE: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Marieke Janssen
>hitting like crazy and safe Confirmed, thank you. /MJ

Re: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Axb
On 11/09/2014 06:59 PM, Axb wrote: On 11/09/2014 06:45 PM, Rich Wales wrote: Hi. Recently, I've noticed that some spam arriving on my mail server contains a "Received:" header line citing amavisd-new -- possibly an attempt to trick spam filters into concluding the message has already been scann

Re: Fake amavisd-new header lines in recent spam

2014-11-09 Thread Axb
On 11/09/2014 06:45 PM, Rich Wales wrote: Hi. Recently, I've noticed that some spam arriving on my mail server contains a "Received:" header line citing amavisd-new -- possibly an attempt to trick spam filters into concluding the message has already been scanned and is presumably free of problem

Fake amavisd-new header lines in recent spam

2014-11-09 Thread Rich Wales
Hi. Recently, I've noticed that some spam arriving on my mail server contains a "Received:" header line citing amavisd-new -- possibly an attempt to trick spam filters into concluding the message has already been scanned and is presumably free of problems. Here is an example of one of these -- t