# Frequently Asked Questions
* [ Why append timestamp in maildir path](faq/why.append.timestamp.in.maildir.path.html)
# How to
* [ How to allow user to send email without authentication
](howto/allow.user.to.send.email.without.authentication.html)
* [ Amavisd + SpamAssassin not working, no mail header (X-Spam-*) inserted.](howto/amavisd.no.x-spam.headers.html)
* [ How to completely disable amavisd/ClamAV/SpamAssassin](howto/completely.disable.amavisd.clamav.spamassassin.html)
* [ How to disable spam virus scanning for outgoing mails](howto/disable.spam.virus.scanning.for.outgoing.mails.html)
* [ Configure Thunderbird as mail client (IMAP, SMTP and global ldap address book)](howto/howto.configure.thunderbird.for.iredmail.html)
* [ How to enable SMTPS service (SMTP over SSL, port 465)](howto/howto.enable.smtps.service.html)
* [ How to pipe incoming email for certain user to external script ](howto/pipe.incoming.email.for.certain.user.to.external.script.html)
* [ How to quarantine clean mail into SQL database](howto/quarantining.clean.mail.html)
* [ How to force Dovecot to recalculate mailbox quota
](howto/recalculate.mailbox.quota.html)
* [ How to store spamassassin bayes in SQL](howto/store.spamassassin.bayes.in.sql.html)
* [ How to perform silent/unattended iRedMail installation](howto/unattended.iredmail.installation.html)
* [ How to use or migrate password hashes](howto/use.or.migrate.password.hashes.html)
# Backup and Restore
* [How to migrate old iRedMail server to the latest stable release](backup-restore/migrate.to.new.iredmail.server.html)
# Troubleshooting and Debug
* [ How to turn on debug mode in Dovecot](troubleshooting/turn.on.debug.mode.in.dovecot.html)