============================= 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 :manpage:`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= 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.