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authorEric S. Raymond <esr@thyrsus.com>1998-02-17 20:20:19 +0000
committerEric S. Raymond <esr@thyrsus.com>1998-02-17 20:20:19 +0000
commit828b8f6279f5bdd0eb9d53de892209e1fd679cde (patch)
treee81842376d0290d1e953c84516bbd5cbb374142c
parent864f64246853e7732e506b4c518ff50650696e68 (diff)
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svn path=/trunk/; revision=1642
-rw-r--r--fetchmail-FAQ.html75
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diff --git a/fetchmail-FAQ.html b/fetchmail-FAQ.html
index 4f6b9d57..c075d349 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: 1998/02/16 16:07:28 $
+<td width="30%" align=right>$Date: 1998/02/17 20:20:19 $
</table>
<HR>
<H1>Frequently Asked Questions About Fetchmail</H1>
@@ -82,7 +82,6 @@ when I may have multiple login sessions going?</a><br>
<a href="#R6">R6. Fetchmail dumps core when I use a .netrc file but works otherwise.</a><br>
<a href="#R7">R7. Running fetchmail in daemon mode doesn't work.</a><br>
<a href="#R8">R8. Fetchmail hangs when used with pppd.</a><br>
-<a href="#R9">R9. Fetchmail fails when used with a dynamic PPP link.</a><br>
<h1>Disappearing mail</h1>
@@ -377,16 +376,29 @@ generally available on IMAP servers.<P>
<hr>
<h2><a name="G9">G9. Is any special configuration needed to use a dynamic IP address?</a></h2>
-No. Fetchmail itself doesn't care whether the IP address you use is
-static (fixed) or dynamic (varying, allocated at connection time by
-your ISP from an address pool). In fact, fetchmail normally doesn't
-use your address explicitly at all; it only cares that you have a
-working gateway.<P>
+Yes. In order to avoid giving indigestion to certain picky MTAs
+(notably <a href="#T3">exim</a>), fetchmail always makes the RCPT TO
+address it feeds the MTA a fully qualified one with a hostname part.
+Normally it does this by appending @ and your client machine's
+hostname.<P>
-Sendmail, however, can get get confused by dynamic addresses in a way
-that looks like a fetchmail problem; see <a href="#R9">R9</a><P>.
+This, however, can create problems when fetchmail is running in daemon
+mode and outlasts the dynamic IP address assignment your client
+machine had when it started up.<P>
+
+Since the new IP address (looked up at RCPT TO interpretation time)
+doesn't match the original, the most benign possible result is that
+your MTA thinks it's seeing a relaying attempt and refuses. More
+frequently, fetchmail will try to connect top a nonexistent host
+address and time out. Worst case, you could up forwarding your mail
+to the wrong machine!<P>
-Only one fetchmail option interacts with your IP address at all,
+Use the <code>smtpaddress</code> option to force the appended hostname
+to one with a (fixed) IP address of 127.0.0.1 in your
+<code>/etc/hosts</code>. (The name `localhost' will usually work; or
+you can use the IP address itself).<P>
+
+Only one fetchmail option interacts directly with your IP address,
`<code>interface</code>'. This option can be used to set the gateway
device and restrict the IP address range fetchmail will use. Such a
restriction is sometimes useful for security reasons, especially on
@@ -1270,47 +1282,6 @@ fetchmail doesn't play well with it, but works with pppd if `demand'
is turned off. We have no idea why this is.<p>
<hr>
-<h2><a name="R9">R9. Fetchmail fails when used with a dynamic PPP link.</a></h2>
-
-The diagnostic of this problem is that your MTA, on the receiving end
-of an SMTP forward from fetchmail, interprets the RCPT TO delivery
-address as arequest to relay. If relaying is disabled, sendmail will
-refuse with the complaint <code>551 ... we do not relay</code>. If
-relaying is allowed, your MTA may send a "host misconfiguration"
-error notification to postmaster, and bounce the message (ouch).<P>
-
-In order to avoid giving indigestion to certain picky MTAs (notably <a
-href="#T3">exim</a>), fetchmail always makes the RCPT TO address it
-feeds the MTA a fully qualified one with a hostname part. Normally it
-does this by appending @ and your client machine's hostname.<P>
-
-This, however, can create problems when your MTA is running in daemon
-mode and outlasts the dynamic IP address assignment your client
-machine had when the MTA started up. Since the new IP address (looked
-up at RCPT TO interpretation time) doesn't match the original, your
-MTA thinks it's seeing a relaying attempt and refuses.<P>
-
-The simplest way to fix this is to use the <code>smtpaddress</code>
-option to force the appended hostname to one with a (fixed) IP address
-of 127.0.0.1 in your <code>/etc/hosts</code>. (The name `localhost'
-will usually work).<P>
-
-If your MTA is sendmail, another possible fix is to restart each time
-you connect to your ISP:<P>
-
-<pre>
- kill -HUP `head -1 /var/run/sendmail.pid`
-</pre>
-
-If neither of these fixes the problem, you might have to put your
-dynamic IP address in whatever your sendmail is using for a cw file
-(/etc/sendmail.cw). Ryan Murray reports "my ip-up script for PPP puts
-my fully qualified domain name at the bottom of /etc/hosts (building
-from a template), sends the name off to sendmail.cw, restarts
-sendmail, and then starts fetchmail." (This script is available in
-the contrib directory of the fetchmail source distribution.)<P>
-
-<hr>
<h2><a name="D1">D1. I think I've set up fetchmail correctly, but I'm not getting any mail.</a></h2>
Maybe you have a .forward or alias set up that you've forgotten about. You
@@ -1806,7 +1777,7 @@ 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: 1998/02/16 16:07:28 $
+<td width="30%" align=right>$Date: 1998/02/17 20:20:19 $
</table>
<P><ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com">&lt;esr@snark.thyrsus.com&gt;</A></ADDRESS>