postfwd/etc/postfwd.cf.sample

###################################################################################################
##
##   ATTENTION: Do NOT use this configuration without your own customizations!
##              Please see the manual ('postfwd -m') for more information.
##
###################################################################################################


##
## Definitions
##

# Greylisting with postgrey @ 127.0.0.1:10031
&&GREYLIST { \
	action=ask(127.0.0.1:10031); \
};

# Maintenance times
&&MAINTENANCE { \
        date=15.01.2007 - 15.01.2007 ; \
        date=15.04.2007 - 15.04.2007 ; \
        date=15.07.2007 - 15.07.2007 ; \
        date=15.10.2007 - 15.10.2007 ; \
        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=&&GREYLIST   ;  &&DYNAMIC
id=GREY_005 ;  action=&&GREYLIST   ;  HIT_dnsbls>=1

# Greylisting should be safe during out-of-office times
id=GREY_006 ;  action=&&GREYLIST   ;  days=Sat-Sun
id=GREY_007 ;  action=&&GREYLIST   ;  days=Mon-Fri ; time=!!06:00:00-20:00:00