################################################################################################### ## ## ATTENTION: This example configuration uses features which require at least postfwd 1.30! ## Please see the manual ('postfwd -m') for example syntax for prior versions. ## ## WARNING: Only provided to show some capabilities of postfwd. Do NOT use this without ## modifications to suit your environment! ## ################################################################################################### ## ## Definitions ## # Maintenance times &&MAINTENANCE { date=15.01.2007 date=15.10.2007 - 17.10.2007 days=Sat-Sun time=03:00:00 - 04:00:00 } # Whitelists &&TRUSTED_NETS { client_address=192.168.1.0/22 client_address=172.16.128.32/27 } &&TRUSTED_HOSTS { client_name~=\.domain1\.net$ client_name~=\.domain2\.de$ } &&TRUSTED_USERS { sasl_username==bob sasl_username==alice } &&TRUSTED_TLS { ccert_fingerprint==11:22:33:44:55:66:AA:BB:CC:DD:EE:FF ccert_fingerprint==AA:BB:CC:DD:EE:FF:11:22:33:44:55:66 encryption_keysize>=64 } &&FREEMAIL { client_name~=\.gmx\.net$ client_name~=\.web\.de$ client_name~=\.(aol|yahoo|h(ush|ot)mail)\.com$ } &&STATIC { # contains freemailers &&FREEMAIL client_name~=[\.\-]static[[\.\-] client_name~=^(mail|smtp|mout|mx)[\-]*[0-9]*\. } &&DNSWLS { rbl=list.dnswl.org rbl=exemptions.ahbl.org rbl=query.bondedsender.org rbl=hostkarma.junkemailfilter.com/^127\.0\.0\.1$/3600 rhsbl_client=hostkarma.junkemailfilter.com/^127\.0\.0\.1$/3600 } # Spamchecks &&BADHELO { client_name==!!($$(helo_name)) } &&DYNAMIC { client_name==unknown client_name~=(\-.+){4} client_name~=\d{5} client_name~=[_\.\-]([axt]{0,1}dsl|br(e|oa)dband|ppp|pppoe|dynamic|dynip|ADSL|dial(up|in)|pool|dhcp|leased)[_\.\-] } &&DNSBLS { rbl=zen.spamhaus.org rbl=list.dsbl.org rbl=bl.spamcop.net rbl=dnsbl.sorbs.net rbl=ix.dnsbl.manitu.net rhsbl=rddn.dnsbl.net.au rhsbl=rhsbl.ahbl.org rhsbl=rhsbl.sorbs.net } ## ## Ruleset ## # temporary reject and drop connection during maintenance window id=M_001 &&MAINTENANCE action=421 maintenance - please try again later # stress-friendly behaviour (will not match on postfix version pre 2.5) id=STRESS stress==yes action=dunno # Whitelists id=WL_001 &&TRUSTED_NETS action=dunno id=WL_002 &&TRUSTED_HOSTS action=dunno id=WL_003 &&TRUSTED_USERS action=dunno id=WL_004 &&TRUSTED_TLS action=dunno # DNSWL checks - lookup id=RWL_001 &&DNSWLS rhsblcount=all ; rblcount=all action=set(HIT_dnswls=$$rhsblcount,HIT_dnswls+=$$rblcount,DSWL_text=$$dnsbltext) # DNSWL - whitelisting id=RWL_002 HIT_dnswls>=2 action=PREPEND X-PFW-STATE: INFO: [$$DSWL_text] id=RWL_003 HIT_dnswls>=1 action=PREPEND X-PFW-STATE: INFO: [$$DSWL_text] ; &&STATIC id=RWL_004 HIT_dnswls>=1 action=PREPEND X-PFW-STATE: INFO: [$$DSWL_text] ; $$client_name~=$$(sender_domain)$ # DNSBL checks - lookup id=RBL_001 &&DNSBLS rhsblcount=all ; rblcount=all action=set(HIT_dnsbls=$$rhsblcount,HIT_dnsbls+=$$rblcount,DSBL_text=$$dnsbltext) # DNSBL checks - evaluation id=RBL_002 HIT_dnsbls>=2 action=554 5.7.1 blocked using $$DSBL_count dnsbls, INFO: [$$DSBL_text] id=RBL_003 HIT_dnsbls>=1 &&DYNAMIC action=REJECT listed on dnsbl and $$client_name looks like dynip, INFO: [$$DSBL_text] id=RBL_004 HIT_dnsbls>=1 &&BADHELO action=REJECT listed on dnsbl and $$helo_name does not match $$client_name, INFO: [$$DSBL_text] # Rate limits id=RATE_001 HIT_dnsbls>=1 action=rate($$client_address/1/300/450 4.7.1 please do not try more than once per 5 minutes) id=RATE_002 &&DYNAMIC action=rate($$client_address/1/300/450 4.7.1 please do not try more than once per 5 minutes) # Selective greylisting id=GREY_001 action=dunno &&STATIC id=GREY_002 action=dunno $$client_name~=$$(sender_domain)$ id=GREY_003 action=dunno HIT_dnswls>=1 id=GREY_004 action=greylisting &&DYNAMIC id=GREY_005 action=greylisting HIT_dnsbls>=1 # Greylisting should be safe during out-of-office times id=GREY_006 action=greylisting days=Sat-Sun id=GREY_007 action=greylisting days=Mon-Fri time=!!06:00:00-20:00:00