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-rw-r--r--fetchmail-FAQ.html9
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@@ -2508,6 +2508,15 @@ env PATH=/opt/openssl1.0.0/bin /opt/openssl1.0.0/bin/c_rehash /home/hans/certs
<h2><a id="R15" name="R15">R15. Help, I'm getting Authorization failure!</a></h2>
+<p>First, try upgrading to fetchmail 6.3.18 or newer. Release 6.3.18 has
+received a considerable number of bug fixes for the authentication
+feature (AUTH, AUTHENTICATE, SASL). Most notably, fetchmail aborts SASL
+authentication attempts properly with an asterisk if it detects that it
+cannot make progress with a particular authentication scheme. This fixes
+issues where GSSAPI-enabled fetchmail cannot authenticate against
+Microsoft Exchange 2007 and 2010. <strong>Note</strong> that this is a
+bug in old fetchmail versions!</p>
+
<p>Fetchmail by default attempts to authenticate using various schemes.
Fetchmail tries these schemes in order of descending security, meaning
the most secure schemes are tried first.</p>