> On Nov 6, 2017, at 6:15 AM, Dominic Raferd <domi...@timedicer.co.uk> wrote: > > > We need to bloc some incoming emails from certain domains. > > How to write rules to bloc a domain with all its variant of tld? > > So say use pcre and study http://www.postfix.org/pcre_table.5.html. Example > (untested): > > /@example\..*$/ REJECT
This will block "example" at more than just the 2LD level. For just 2LD blocking: main.cf: smtpd_sender_restrictions = check_sender_access pcre:${config_directory}/sender-access.pcre sender-access.pcre: /@example\.[^.]+$/ REJECT email from example.* not wanted here Mind you, I would not recommend such rules to anyone. Just block the domains specifically observed to send unwanted email. If you really want to block all tlds, there are only 1510 live at present and 31 in "test mode" with no delegations. It is easy to machine generate a complete list of patterns for a regular indexed table. You can download the list of TLDS from a number of places, or even the complete root zone file. -- Viktor. $ openssl base64 -d <<'EOF' | gunzip -c > live-tlds.txt H4sIAEN5AFoAA2WZ7bKzLM+G/7Mv98xqV9dHNwcVlVbFAra1W/8eJ9p1PTPvjCTh G0ISErTWGmvjbGxlY+5BlVLIWejuHagmDSJCZ5sAXpreVt5YKmrbuHEF127KS3Si wjJlO+X/IRM0Hevs72qRQzS24dMIDZXNMtCcKteRIk1dnlhYy2dHP6x1GGc7MU87 kKKvqaRpZ6+9ncBuqqlkSb5TYgAfqyUJtSHWTkR29L02NAcPrY1hdDQcfMXehWfL GMPQ+slOL1Ep2+xEqDxZDUNZGI3V57SMyT3n6FL6y2/rVfYJaEvLstwxZRcb5Sc7 rNnX9NE0LCGwoBn2j66wap6VxPEb32KjG5SBZ9GO4mOse7Yaxfc4M3TMSjShc2oo SF4ghdqzAQqpz/3gMqUZ5k+OngsfBxLgx9L4Asopg5liSXNIdFtyr8NaciiAse7e TtrPg48su3ySYyMvHT+chJ0rwDcLcCqMEJ7Yx7xUg6+VbQSugKhUuyFMtlCDXWsb mzedRLg2hCyis35SSXIVpyLi6vJOLj2LBq8uTgYprpDbqqJbdWfkuiNRzsAs0ln4 DFwyK3WONcD5wSkTB08zx94FqkVl0K2pGKHng9PeVPrErsozor+KmLoCAlDpZaqL qQZbXzeI1DYIGPTEGVZDqK9IaNbkQ+gEwsj0ohaGG/lY4/gwFeuZ2OE0IyMIK6X0 D2ULwfWROTVIaNkmslkFMTeoSbgWUFYGB9U+1b1g9teCOP1KrA1L9jdNGzgsBouo 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