Am 06.02.2014 10:41, schrieb Tim Dickson: > On 05/02/2014 03:50, LuKreme wrote: >> On 30 Jan 2014, at 11:50 , Tim Dickson <[email protected]> >> wrote: >> >>> I am trying to filter mail with .exe and .zip attachments, to no >>> success. >> Are you using postfix with dovecot? > I am, (standard slackware) but I will be moving to dovecot-lda so that I > can use sieve and imap with maildirs instead of mbox. >> $ cat mime_headers.pcre >> /^\s*Content-(Disposition|Type).*name\s*=\s*"?(.*\.(ade|adp|bas|bat|chm|cmd|com|cpl|crt|dll|exe|hlp|hta|inf|ins|isp|js|jse|lnk|mdb|mde|mdt|mdw|msc|msi|msp|mst|nws|ops|pcd|pif|prf|reg|scf|scr\??|sct|shb|shs|shm|swf|vb[esx]?|vxd|wsc|wsf|wsh))(\?=)?"?\s*(;|$)/x >> REJECT Attachment name "$2" may not end with ".$3” >> $ grep mime main.cf >> mime_header_checks = pcre:$config_directory/mime_headers.pcre >> >> >> > Very useful blocking filter, many thanks. > Does it generate backscatter.?
No , should reject at smtp income data stage, but look http://www.postfix.org/header_checks.5.html for more info > I have come across a number of spam emails which have more than one > address in the from field. Would this filter send the spam to those > addresses by way of a mail bounce.? not sure if i understand... if it rejects at income smtp data stage, recipients are not a matter of interest > > The main reason for the filtering is because our broadband data > allowance was maxed out due to spam, malware spam and backscatter. I am > having to move my mail server functionality off-site and filter it on a > vps running slackware, dovecot and pigeonhole, before collecting it per > mailbox via my internal server. you should integrate clamav with sanesecurity antispam, and spamassassin and/or amavis, take the questions to the amamvis postfix list, questions fot filter sieve tagged mails go to dovecot list or have a look at http://wiki2.dovecot.org/Pigeonhole/Sieve/Examples Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
