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=============================
Frequently Answered Questions
=============================
.. _faq-no-add-user-button-or-link:
No "Add User" Button or Link
============================
If this link is not there (you would also not have been presented with a form),
you do not have permissions, you did not configure SELinux the way it was
documented, firewall, DNS.
Log Messages
============
.. seealso::
* :ref:`admin_faq_email-blocked-spamhaus`
Unable to open /etc/sasldb2
---------------------------
No :file:`user_deny.db`
-----------------------
.. parsed-literal::
IOERROR: opening /var/lib/imap/user_deny.db: No such file or directory
No authentication
------------------
.. parsed-literal::
TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits new) no authentication
Debug level information, can be ignored. You can reduce verbosity by
setting ``debug: 0`` in :man:`imapd.conf(5)`, or by not including debug
messages on the mail facility in syslog.
Unable to setsocketopt
-----------------------
.. parsed-literal::
unable to setsocketopt(IP_TOS) service ptloader/unix: Operation not supported
Informational message issued on startup. Not critical.
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.

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