faq.rst
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	=============================
	Frequently Answered Questions
	=============================

	Log Messages
	============

	.. seealso::

	* :ref:`admin_faq_email-blocked-spamhaus`

	Unable to open /etc/sasldb2
	---------------------------

	No :file:`user_deny.db`
	-----------------------

	IOERROR: opening /var/lib/imap/user_deny.db: No such file or directory

	Anti-Spam
	=========

	No ``X-Spam`` Headers
	---------------------

	.. _admin_faq_email-blocked-spamhaus:

	Email Blocked Using zen.spamhaus.org
	------------------------------------

	You are seeing the following in :file:`/var/log/maillog` (line breaks added for
	legibility):

	.. parsed-literal::

	NOQUEUE: reject: RCPT from unknown[3.2.1.0]: 554 5.7.1 Service \\
	unavailable; Client host [3.2.1.0] blocked using zen.spamhaus.org; \\
	from=<something@domain.tld>

	This message indicates your SMTP server, receiving a message from the Internet,
	has refused the message.

	The sending host (at IP address 3.2.1.0) is blocked using a centralized,
	external service (spamhaus.org), that keeps track of hosts and networks on the
	Internet with a reputation of spamming.

	For more information on this service, see http://www.spamhaus.org/zen/.

	You will want to continue performing these checks, but just in case you do not
	want to, the relevant setting in Postfix is:

	.. parsed-literal::

	# postconf smtpd_sender_restrictions

	It is the responsibility of the sending host to notify the original sender the
	message was not delivered.