projects / exim.git / blame
| Commit | Line | Data |
|---|---|---|
| e0f3765a PH |
1 | From: Suresh Ramasubramanian <linux@frodo.hserus.net> |
| 2 | Date: Mon, 11 Aug 2003 11:57:39 +0530 | |
| 3 | ||
| 4 | I've been seeing a whole bunch of IPs that send me spam / virus mail and | |
| 5 | HELOing as one of my own IPs, or as HELO one.of.my.own.domains (or maybe | |
| 6 | HELO primary_hostname) | |
| 7 | ||
| 8 | On the other hand, I have users relaying through my box with AUTH, using | |
| 9 | mozilla, which HELO's as "HELO hserus.net" if a hserus.net user relays. | |
| 10 | ||
| 11 | Here's something to stop this stuff - in acl_check_rcpt: | |
| 12 | ||
| 13 | [snippet in exim configure file] | |
| 14 | ||
| 15 | accept hosts = : | |
| 16 | ||
| 17 | # Accept all authenticated senders | |
| 18 | accept authenticated = * | |
| 19 | ||
| 20 | # Spam control | |
| 21 | ||
| 22 | # Be polite and say HELO. Reject anything from hosts that havn't given | |
| 23 | # a valid HELO/EHLO to us. | |
| 24 | deny condition = ${if \ | |
| 25 | or{{!def:sender_helo_name}{eq{$sender_helo_name}{}}}{yes}{no}} | |
| 26 | message = RFCs mandate HELO/EHLO before mail can be sent | |
| 27 | ||
| 28 | # Forged hostname - HELOs as my own hostname or domain | |
| 29 | deny message = Forged hostname detected in HELO: $sender_helo_name | |
| 30 | hosts = !+relay_from_hosts | |
| 31 | log_message = Forged hostname detected in HELO: \ | |
| 32 | $sender_helo_name | |
| 33 | condition = ${lookup {$sender_helo_name} \ | |
| 34 | lsearch{/usr/local/etc/exim/local_domains}{yes}{no}} | |
| 35 | ||
| 36 | # Forged hostname -HELOs as one of my own IPs | |
| 37 | deny message = Forged IP detected in HELO: $sender_helo_name | |
| 38 | hosts = !+relay_from_hosts | |
| 39 | log_message = Forged IP detected in HELO: $sender_helo_name | |
| 40 | condition = ${if \ | |
| 41 | eq{$sender_helo_name}{$interface_address}{yes}{no}} | |
| 42 | ||
| 43 | [end snippet] | |
| 44 |