diff options
Diffstat (limited to 'fetchmail-FAQ.html')
| -rw-r--r-- | fetchmail-FAQ.html | 89 |
1 files changed, 32 insertions, 57 deletions
diff --git a/fetchmail-FAQ.html b/fetchmail-FAQ.html index b5535085..3c8340f5 100644 --- a/fetchmail-FAQ.html +++ b/fetchmail-FAQ.html @@ -10,7 +10,7 @@ <table width="100%" cellpadding=0><tr> <td width="30%">Back to <a href="index.html">Fetchmail Home Page</a> <td width="30%" align=center>To <a href="/~esr/sitemap.html">Site Map</a> -<td width="30%" align=right>$Date: 1998/07/25 18:15:58 $ +<td width="30%" align=right>$Date: 1998/07/31 20:56:28 $ </table> <HR> <H1>Frequently Asked Questions About Fetchmail</H1> @@ -55,7 +55,7 @@ IP address?</a><br> <a href="#C1">C1. Why do I need a .fetchmailrc when running as root on my own machine?</a><br> <a href="#C2">C2. How can I arrange for a fetchmail daemon to get killed when I log out?</a><br> <a href="#C3">C3. How do I know what interface and address to use with --interface?</a><br> -<a href="#C4">C4. How can I set up support for sendmail's anti-spam 571 response?</a><br> +<a href="#C4">C4. How can I set up support for sendmail's anti-spam features?</a><br> <h1>How to make fetchmail play nice with other software:</h1> @@ -831,73 +831,48 @@ would work. To range over any value of the last two octets </pre> <hr> -<h2><a name="C4">C4. How can I set up support for sendmail's anti-spam 571 response?</a></h2> +<h2><a name="C4">C4. How can I set up support for sendmail's anti-spam features?</a></h2> -Rachel Polanskis <r.polanskis@nepean.uws.edu.au> writes:<p> +This answer covers versions of sendmail from 8.8.7 (the version +installed in Red Hat 5.1) upwards. If you have an older version, +upgrade to sendmail 8.9.<P> -Basically you need to use the "check_*" rules in sendmail. -These are rules introduced since version 8.8.2<p> +Stock sendmails can now do anti-spam exclusions based on a database of +filter rules. The human-readable form of the database is at +<tt>/etc/mail/deny</tt>. The database itself is at +<tt>/etc/mail/deny.db</tt>.<P> -The idea is to generate a list of domains and addresses that are placed into -a file - I call mine "sendmail.rej" and you place just one domain -or email address on each line. During the SMTP transaction, this file -is checked and if there is a match, the message is refused, with -a suitable "Service not available" message sent back to the sender.<p> - -With the feature enabled in fetchmail, the mail is simply deleted, -with no further processing.<p> - -The only drawback when blocking spam with fetchmail is that you -do not get the satisfaction of sending an error back to the sender.<p> - -To actually use the check_mail rules in sendmail 8.8.2 or better, -you need to know how to generate a sendmail.cf file from the m4 -config files distributed with sendmail.<p> - -The actual rules can be found at the following URLS:<p> - -<a href="http://www.informatik.uni-kiel.de/%7Eca/email/check.html"> -http://www.informatik.uni-kiel.de/%7Eca/email/check.html</a><p> - -This one is by Claus Aßman, who has documented more of sendmail then -I can digest! - -Remember, when copying these rulesets off the web, that there are tabs -embedded in them, that may not be preserved. You <em>must</em> reintroduce -these tabs into the rules to make them work properly. <p> - -Once you have your ruleset in place, and have generated a nice sendmail.cf -file, and the list of blocked sites, try telneting to your -SMTP port to test it, and send a message with a blocked address in it.<p> +<P>The table itself uses email addresses, domain names, and network +numbers as keys. For example,</P> +<PRE> +spammer@aol.com REJECT +cyberspammer.com REJECT +192.168.212 REJECT +</PRE> +<P>would refuse mail from spammer@aol.com, any user from +cyberspammer.com (or any host within the cyberspammer.com domain), and +any host on the 192.168.212.* network. (This feature can be used to +do other things as well; see the <a +href="http://www.sendmail.org/m4/anti-spam.html">sendmail +documentattion</a> for details)</P> -You should see a message similar to:<p> +To actually set up the database, run <pre> - "571 unsolicited email is refused" +makemap hash deny <deny </pre> +in /etc/mail.<P> -Next, if you have access to a host that you can send mail from, that -is <em>not</em> your mail host, add that host to your spamlist and -restart sendmail.<p> - -Send a message to your mailing address from that host and then pop off -the message with fetchmail, using the -v argument. You can monitor -the SMTP transaction, and when the FROM address is parsed, if sendmail -sees that it is an address in spamlist, fetchmail will flush and -delete it.<p> +To test, send a message to your mailing address from that host and +then pop off the message with fetchmail, using the -v argument. You +can monitor the SMTP transaction, and when the FROM address is parsed, +if sendmail sees that it is an address in spamlist, fetchmail will +flush and delete it.<p> Under no circumstances put your <strong>mailhost</strong> or <strong>any host you accept mail from</strong> using fetchmail into your reject file. You <strong>will</strong> lose mail if you do this!!!<p> -The check_ rules work, and they work well. Coupled with fetchmail's -ability to respond to the appropriate error messages, you can be assured -of never seeing a spam from any address you put in the reject list.<p> - -The only thing that is missing, as mentioned previously, is the ability -to allow sendmail to process the message further and generate an error -message to the sender. <p> - <hr> <h2><a name="T1">T1. How can I use fetchmail with sendmail?</a></h2> @@ -2089,7 +2064,7 @@ Re-ordering messages is a user-agent function, anyway.<P> <table width="100%" cellpadding=0><tr> <td width="30%">Back to <a href="index.html">Fetchmail Home Page</a> <td width="30%" align=center>To <a href="/~esr/sitemap.html">Site Map</a> -<td width="30%" align=right>$Date: 1998/07/25 18:15:58 $ +<td width="30%" align=right>$Date: 1998/07/31 20:56:28 $ </table> <P><ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com"><esr@snark.thyrsus.com></A></ADDRESS> |