annotate dnsbl.conf @ 203:92a5c866bdfa

Verify from/to pairs even if they might be explicitly whitelisted. Document DCC greylisting and bulk detection usage. Fix DCC bulk thresholds of many. Update spec file for fedora packaging.
author Carl Byington <carl@five-ten-sg.com>
date Tue, 04 Mar 2008 21:42:51 -0800
parents 8b86a894514d
children 784030ac71f1
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1 context main-default {
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2 // outbound dnsbl filtering to catch our own customers that end up on the sbl
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3 dnsbl sbl sbl-xbl.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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4 dnsbl_list sbl;
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5
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6 // outbound content filtering to prevent our own customers from sending spam
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7 content on {
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8 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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9 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
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10 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
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11 ignore { include "hosts-ignore.conf"; };
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12 tld { include "tld.conf"; };
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13 cctld { include "cctld.conf"; };
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14 html_tags { include "html-tags.conf"; };
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15 html_limit on 20 "Mail containing excessive bad html tags rejected";
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16 html_limit off;
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17 host_limit on 20 "Mail containing excessive host names rejected";
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18 host_limit soft 20;
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19 spamassassin 4;
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20 require_match yes;
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21 dcc_greylist yes;
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22 dcc_bulk_threshold 50;
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23 };
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24
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25 // backscatter prevention - don't send bounces for mail that we accepted but could not forward
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26 // we only send bounces to our own customers
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27 env_from unknown {
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28 "<>" black;
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29 };
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30
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31 // hourly recipient rate limit by smtp auth client id
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32 rate_limit 30 { // default
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33 #fred 100; // override default limits
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34 #joe 10; // ""
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35 };
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36 };
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37
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38 context main {
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39 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
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40 dnsbl local blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
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41 dnsbl sbl zen.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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42 dnsbl xbl xbl.spamhaus.org "Mail from %s rejected - xbl; see http://www.spamhaus.org/query/bl?ip=%s";
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43 dnsbl_list local sbl;
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44
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45 content on {
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46 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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47 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
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48 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
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49 ignore { include "hosts-ignore.conf"; };
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50 tld { include "tld.conf"; };
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51 cctld { include "cctld.conf"; };
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52 html_tags { include "html-tags.conf"; };
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53 html_limit off;
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54 host_limit soft 20;
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55 spamassassin 5;
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56 require_match yes;
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57 dcc_greylist yes;
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58 dcc_bulk_threshold 20;
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59 };
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60
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61 generic "(^|[.-])(ppp|h|host)?([0-9]{1,3}[.-](Red-|dynamic[.-])?){4}"
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62 "your mail server %s seems to have a generic name";
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63
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64 env_to {
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65 # !! replace this with your domain names
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66 # child contexts are not allowed to specify recipient addresses outside these domains
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67 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
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68 include "/etc/mail/local-host-names";
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69 };
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70
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71 context whitelist {
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72 content off {};
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73 env_to {
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74 # dcc_to ok { include "/var/dcc/whitecommon"; };
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75 };
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76 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
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77 # so all mail TO these env_to addresses is accepted
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78 };
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79
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80 context abuse {
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81 dnsbl_list xbl;
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82 content off {};
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83 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
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84 env_to {
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85 abuse@ # no content filtering on abuse reports
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86 postmaster@ # ""
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87 };
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88 env_from unknown {}; # ignore all parent white/black listing
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89 };
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90
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91 context minimal {
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92 dnsbl_list sbl;
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93 content on {
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94 spamassassin 10;
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95 dcc_bulk_threshold many;
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96 };
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97 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
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98 env_to {
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99 };
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100 };
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101
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102 context blacklist {
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103 env_to {
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104 # dcc_to many { include "/var/dcc/whitecommon"; };
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105 };
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106 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
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107 # so all mail TO these env_to addresses is rejected
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108 };
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109
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110 env_from unknown {
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111 abuse@ abuse; # replies to abuse reports use the abuse context
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112 # dcc_from { include "/var/dcc/whitecommon"; };
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113 };
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114
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115 autowhite 90 "autowhite/my-auto-whitelist";
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116 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
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117 };
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118