1. Check you have correctly configured the scheduled tasks.

2. Check the cron service is still running. If not, restart it :

service crond restart

3. Run the command indicated in your crontab :
Ex: /usr/bin/php /var/www/Kernel/private/mailingQueue.php

To know the exact command, run the following in a shell :
crontab -l -u www
(the linux user may differ, it's the user who runs the webserver)

and see if no errors (PHP Warning, etc) are happening when you run the command.

 

4. Check the mailing_recipients MySQL table is not corrupted. For example, in phpMyAdmin try to browse through the table (seeing the structure of the table is not enough, as the datas only could be corrupted). If you receive an error message, try to repair the table :

REPAIR TABLE mailing_recipients

Generally the repair is successfull. If it's not consider the previous datas lost and copy the mailing_recipients table from another instance of Officity.