We received junk mails from a specific source sometimes that it showed in the log as cmxx-xx-xx-xx.hkcable.com.hk. The xx-xx... is the IP address that changes every time. The "Mail From" address (which is what iMail Kill file will exam) changes every time as well. What would be the best stragetic in this case? Would someone please shed me some light for us?
cm = cable modem
the perl-compatible regular expression, PCRE, for it is:
/(^cm.*.hkcable.com.hk$)/ 554 Subcriber access networks are not authorized to send to our MX. Get TF outta here.
But I can't find where Imail supports what they call "search expressions" applied to PTR hostname (PTR hostname are also missing from Imail logging)or HELO hostname. Full PCRE, applicable to all SMTP items, in IMail 8-something would be a huge step forward.
The IMGate list has project underway to update and expand our list of mta_clients_subscriber database of PTR hostnames.
FYI, here's 950 ClassC's that have "cm.*hkcable" in their PTR hostname, to be used in your Imail access list:
203.168.160 203.168.161 203.168.164 203.168.169 203.168.170 203.168.171 203.168.172 203.168.174 203.168.181 203.168.184 203.168.185 203.168.190 203.168.192 203.168.200 203.168.201 203.168.202 203.168.203 203.168.206 203.168.207 203.168.208 203.168.209 203.168.218 203.168.219 203.168.221 203.168.225 203.168.226 203.168.232 203.168.233 203.168.234 203.168.235 203.168.246 203.168.247 203.168.249 203.168.250 203.168.252 203.168.253 203.168.254 203.168.255 218.252.10 218.252.100 218.252.101 218.252.102 218.252.104 218.252.105 218.252.108 218.252.11 218.252.112 218.252.114 218.252.120 218.252.121 218.252.122 218.252.124 218.252.125 218.252.128 218.252.129 218.252.13 218.252.130 218.252.131 218.252.134 218.252.135 218.252.14 218.252.144 218.252.145 218.252.146 218.252.147 218.252.149 218.252.150 218.252.151 218.252.152 218.252.153 218.252.155 218.252.157 218.252.160 218.252.161 218.252.163 218.252.164 218.252.165 218.252.17 218.252.171 218.252.177 218.252.18 218.252.180 218.252.181 218.252.182 218.252.183 218.252.184 218.252.189 218.252.19 218.252.192 218.252.194 218.252.198 218.252.199 218.252.2 218.252.200 218.252.201 218.252.202 218.252.203 218.252.204 218.252.205 218.252.206 218.252.207 218.252.208 218.252.209 218.252.216 218.252.218 218.252.219 218.252.224 218.252.225 218.252.226 218.252.227 218.252.228 218.252.232 218.252.233 218.252.234 218.252.235 218.252.236 218.252.237 218.252.24 218.252.240 218.252.241 218.252.244 218.252.245 218.252.246 218.252.25 218.252.251 218.252.252 218.252.253 218.252.26 218.252.28 218.252.3 218.252.30 218.252.32 218.252.33 218.252.34 218.252.35 218.252.4 218.252.40 218.252.42 218.252.44 218.252.48 218.252.5 218.252.52 218.252.54 218.252.56 218.252.58 218.252.60 218.252.64 218.252.65 218.252.66 218.252.67 218.252.68 218.252.69 218.252.70 218.252.77 218.252.78 218.252.8 218.252.80 218.252.83 218.252.84 218.252.85 218.252.86 218.252.89 218.252.9 218.252.90 218.252.91 218.252.95 218.252.96 218.252.97 218.252.98 218.252.99 218.253.0 218.253.10 218.253.100 218.253.101 218.253.104 218.253.108 218.253.109 218.253.113 218.253.114 218.253.115 218.253.116 218.253.117 218.253.118 218.253.120 218.253.121 218.253.122 218.253.123 218.253.128 218.253.129 218.253.13 218.253.130 218.253.131 218.253.132 218.253.133 218.253.134 218.253.136 218.253.137 218.253.14 218.253.140 218.253.141 218.253.142 218.253.144 218.253.145 218.253.146 218.253.147 218.253.150 218.253.151 218.253.152 218.253.154 218.253.155 218.253.156 218.253.162 218.253.164 218.253.165 218.253.167 218.253.168 218.253.172 218.253.174 218.253.176 218.253.178 218.253.179 218.253.18 218.253.180 218.253.181 218.253.184 218.253.185 218.253.188 218.253.189 218.253.19 218.253.190 218.253.191 218.253.192 218.253.193 218.253.194 218.253.195 218.253.198 218.253.199 218.253.20 218.253.200 218.253.201 218.253.204 218.253.205 218.253.210 218.253.211 218.253.212 218.253.213 218.253.214 218.253.216 218.253.217 218.253.218 218.253.222 218.253.223 218.253.226 218.253.227 218.253.228 218.253.229 218.253.230 218.253.231 218.253.233 218.253.234 218.253.237 218.253.238 218.253.239 218.253.24 218.253.244 218.253.245 218.253.246 218.253.25 218.253.250 218.253.252 218.253.253 218.253.254 218.253.255 218.253.28 218.253.31 218.253.34 218.253.36 218.253.4 218.253.40 218.253.41 218.253.42 218.253.43 218.253.44 218.253.45 218.253.46 218.253.48 218.253.5 218.253.51 218.253.54 218.253.55 218.253.56 218.253.59 218.253.64 218.253.65 218.253.66 218.253.67 218.253.68 218.253.72 218.253.73 218.253.74 218.253.75 218.253.77 218.253.78 218.253.8 218.253.80 218.253.82 218.253.83 218.253.84 218.253.85 218.253.86 218.253.88 218.253.89 218.253.9 218.253.90 218.253.91 218.253.92 218.253.93 218.253.96 218.254.100 218.254.103 218.254.104 218.254.112 218.254.113 218.254.114 218.254.122 218.254.123 218.254.124 218.254.125 218.254.126 218.254.13 218.254.130 218.254.133 218.254.136 218.254.137 218.254.138 218.254.142 218.254.144 218.254.145 218.254.146 218.254.147 218.254.148 218.254.15 218.254.150 218.254.151 218.254.152 218.254.153 218.254.154 218.254.155 218.254.157 218.254.158 218.254.159 218.254.16 218.254.160 218.254.161 218.254.162 218.254.163 218.254.166 218.254.167 218.254.168 218.254.169 218.254.17 218.254.171 218.254.176 218.254.177 218.254.178 218.254.18 218.254.185 218.254.186 218.254.187 218.254.190 218.254.192 218.254.194 218.254.196 218.254.197 218.254.198 218.254.2 218.254.20 218.254.200 218.254.202 218.254.204 218.254.205 218.254.206 218.254.208 218.254.209 218.254.21 218.254.210 218.254.211 218.254.212 218.254.213 218.254.215 218.254.217 218.254.218 218.254.22 218.254.220 218.254.221 218.254.222 218.254.224 218.254.225 218.254.23 218.254.230 218.254.231 218.254.232 218.254.234 218.254.240 218.254.244 218.254.245 218.254.246 218.254.247 218.254.248 218.254.249 218.254.251 218.254.252 218.254.253 218.254.26 218.254.27 218.254.3 218.254.30 218.254.31 218.254.32 218.254.34 218.254.35 218.254.36 218.254.37 218.254.4 218.254.40 218.254.41 218.254.42 218.254.43 218.254.44 218.254.45 218.254.46 218.254.47 218.254.48 218.254.49 218.254.52 218.254.53 218.254.54 218.254.60 218.254.61 218.254.62 218.254.63 218.254.64 218.254.65 218.254.67 218.254.70 218.254.74 218.254.76 218.254.78 218.254.8 218.254.80 218.254.81 218.254.82 218.254.83 218.254.89 218.254.9 218.254.90 218.254.91 218.254.92 218.254.93 218.255.104 218.255.105 218.255.109 218.255.112 218.255.113 218.255.116 218.255.12 218.255.120 218.255.121 218.255.122 218.255.123 218.255.124 218.255.125 218.255.126 218.255.128 218.255.13 218.255.130 218.255.131 218.255.133 218.255.134 218.255.137 218.255.14 218.255.140 218.255.142 218.255.146 218.255.148 218.255.152 218.255.153 218.255.16 218.255.17 218.255.170 218.255.174 218.255.176 218.255.18 218.255.182 218.255.186 218.255.188 218.255.192 218.255.193 218.255.194 218.255.195 218.255.197 218.255.198 218.255.199 218.255.204 218.255.205 218.255.206 218.255.207 218.255.209 218.255.21 218.255.210 218.255.214 218.255.22 218.255.228 218.255.232 218.255.236 218.255.242 218.255.253 218.255.30 218.255.32 218.255.33 218.255.34 218.255.35 218.255.36 218.255.37 218.255.4 218.255.40 218.255.41 218.255.44 218.255.5 218.255.50 218.255.51 218.255.58 218.255.6 218.255.60 218.255.61 218.255.64 218.255.68 218.255.74 218.255.75 218.255.76 218.255.77 218.255.78 218.255.79 218.255.8 218.255.80 218.255.82 218.255.83 218.255.88 218.255.90 218.255.92 218.255.93 218.255.94 218.255.96 218.255.97 61.10.10 61.10.100 61.10.102 61.10.103 61.10.104 61.10.107 61.10.109 61.10.110 61.10.111 61.10.112 61.10.114 61.10.115 61.10.116 61.10.117 61.10.118 61.10.121 61.10.122 61.10.123 61.10.124 61.10.127 61.10.128 61.10.129 61.10.13 61.10.130 61.10.131 61.10.133 61.10.134 61.10.136 61.10.143 61.10.144 61.10.145 61.10.146 61.10.147 61.10.148 61.10.149 61.10.151 61.10.153 61.10.154 61.10.158 61.10.16 61.10.162 61.10.164 61.10.165 61.10.166 61.10.167 61.10.168 61.10.171 61.10.172 61.10.176 61.10.18 61.10.180 61.10.182 61.10.184 61.10.185 61.10.186 61.10.187 61.10.188 61.10.19 61.10.190 61.10.191 61.10.192 61.10.194 61.10.196 61.10.197 61.10.20 61.10.200 61.10.201 61.10.204 61.10.206 61.10.207 61.10.210 61.10.211 61.10.212 61.10.213 61.10.214 61.10.215 61.10.22 61.10.223 61.10.226 61.10.228 61.10.229 61.10.23 61.10.230 61.10.232 61.10.234 61.10.235 61.10.236 61.10.237 61.10.238 61.10.244 61.10.245 61.10.247 61.10.249 61.10.252 61.10.253 61.10.28 61.10.29 61.10.30 61.10.32 61.10.33 61.10.34 61.10.35 61.10.39 61.10.40 61.10.45 61.10.51 61.10.52 61.10.53 61.10.56 61.10.57 61.10.58 61.10.64 61.10.67 61.10.72 61.10.73 61.10.74 61.10.8 61.10.82 61.10.83 61.10.84 61.10.85 61.10.86 61.10.87 61.10.88 61.10.89 61.10.9 61.10.92 61.10.94 61.15.10 61.15.101 61.15.102 61.15.103 61.15.105 61.15.107 61.15.11 61.15.118 61.15.120 61.15.122 61.15.123 61.15.124 61.15.125 61.15.126 61.15.128 61.15.129 61.15.13 61.15.130 61.15.132 61.15.133 61.15.134 61.15.135 61.15.136 61.15.138 61.15.139 61.15.140 61.15.141 61.15.142 61.15.143 61.15.145 61.15.152 61.15.153 61.15.154 61.15.156 61.15.157 61.15.159 61.15.16 61.15.164 61.15.165 61.15.168 61.15.170 61.15.173 61.15.174 61.15.175 61.15.176 61.15.177 61.15.180 61.15.181 61.15.188 61.15.189 61.15.190 61.15.191 61.15.192 61.15.193 61.15.194 61.15.199 61.15.2 61.15.20 61.15.200 61.15.201 61.15.204 61.15.205 61.15.208 61.15.21 61.15.217 61.15.22 61.15.220 61.15.223 61.15.224 61.15.225 61.15.226 61.15.227 61.15.228 61.15.23 61.15.232 61.15.233 61.15.238 61.15.239 61.15.240 61.15.241 61.15.242 61.15.244 61.15.245 61.15.248 61.15.249 61.15.250 61.15.251 61.15.252 61.15.253 61.15.254 61.15.255 61.15.26 61.15.28 61.15.29 61.15.3 61.15.30 61.15.31 61.15.34 61.15.35 61.15.41 61.15.42 61.15.43 61.15.44 61.15.45 61.15.46 61.15.47 61.15.5 61.15.52 61.15.53 61.15.54 61.15.55 61.15.58 61.15.6 61.15.60 61.15.61 61.15.62 61.15.63 61.15.66 61.15.67 61.15.71 61.15.72 61.15.75 61.15.76 61.15.78 61.15.8 61.15.80 61.15.81 61.15.86 61.15.90 61.15.92 61.15.93 61.15.96 61.15.97 61.15.98 61.15.99 61.18.104 61.18.105 61.18.109 61.18.11 61.18.112 61.18.113 61.18.116 61.18.117 61.18.120 61.18.121 61.18.122 61.18.123 61.18.124 61.18.125 61.18.128 61.18.131 61.18.133 61.18.134 61.18.135 61.18.136 61.18.137 61.18.138 61.18.139 61.18.142 61.18.143 61.18.144 61.18.145 61.18.147 61.18.148 61.18.149 61.18.150 61.18.151 61.18.152 61.18.156 61.18.160 61.18.161 61.18.162 61.18.163 61.18.164 61.18.165 61.18.166 61.18.167 61.18.17 61.18.172 61.18.173 61.18.174 61.18.175 61.18.176 61.18.177 61.18.178 61.18.179 61.18.180 61.18.181 61.18.182 61.18.185 61.18.187 61.18.19 61.18.191 61.18.196 61.18.198 61.18.2 61.18.20 61.18.200 61.18.201 61.18.202 61.18.203 61.18.204 61.18.205 61.18.207 61.18.216 61.18.218 61.18.219 61.18.22 61.18.220 61.18.221 61.18.225 61.18.226 61.18.227 61.18.228 61.18.234 61.18.240 61.18.241 61.18.242 61.18.243 61.18.244 61.18.245 61.18.248 61.18.249 61.18.252 61.18.254 61.18.255 61.18.26 61.18.28 61.18.29 61.18.3 61.18.31 61.18.32 61.18.36 61.18.37 61.18.38 61.18.4 61.18.40 61.18.41 61.18.43 61.18.44 61.18.45 61.18.48 61.18.49 61.18.5 61.18.52 61.18.54 61.18.55 61.18.56 61.18.57 61.18.58 61.18.59 61.18.60 61.18.61 61.18.62 61.18.63 61.18.66 61.18.67 61.18.68 61.18.70 61.18.72 61.18.73 61.18.77 61.18.78 61.18.8 61.18.84 61.18.87 61.18.88 61.18.90
IMGate blocks them with one line, Imail with 950, and those 950 may not be complete. That difference is why I said in the last few days, if an MX admin wants to block an ISP for continued spew (hkcable clearly qualifies), IMGate PTR filtering is extremely efficient.
This may sound way too gentle for Made Len, but I wouldn't block on the A.B. octet, since hkcable's non-subscriber MTAs are probably in there somewhere.
Len
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