Configuring Whitelist/Blacklist on ZIMBRA 8.5/8.6
ZIMBRA 8.5 and later changed the configuration for blacklists and whitelists. To add whitelist/blacklist entries, follow these steps. Whitelist: create /opt/zimbra…
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White list for ZIMBRA to bypass RBLs
If you use RBLs such as spamhaus.org on ZIMBRA to block spam, a customer's mail server may be blacklisted by the RBLs and unable to send to your system after being identified as potential spam.
Mail preview does not fill the screen in Zimbra Web Client 8.x and Google Chrome
A new Google Chrome version released on 2 September 2015 caused Zimbra Web Client 8.6, 8.5, and 8.0 to display the mail preview incorrectly, cutting it off instead of filling the screen.
How to fix "loopback devices is strongly discouraged for production use" on Docker
Docker 1.6+ on CentOS 7 or RHEL 7 may warn that loopback devices are strongly discouraged for production use when using devicemapper storage.
How to fix dead VLAN (4095) on neutron
If VMs cannot ping their gateway or router after creating a network and router in OpenStack, check the VLAN tags in Open vSwitch on the compute and network nodes.
How to fix cloud-config not work with error "Failed loading yaml blob"
If cloud-config on an AWS EC2 instance or OpenStack does not behave as configured, and the error log shows Failed at merging in cloud config part from ... as below…
How to fix "Error: Queue report unavailable – mail system is down"
If Zimbra cannot send or receive mail while webmail, POP, and IMAP work normally, check the log for "fatal: Queue report unavailable - mail system is down", as in the example zimbra@zm:~$
MySQL ERROR 1206: The total number of locks exceeds the lock table size
A query on an InnoDB table with a very large number of rows may fail with ERROR 1206 (HY000): The total number of locks exceeds the lock table size.
MySQL Replication: 'Got fatal error 1236'
In MySQL replication, the slave retrieves data from the master's binlog and replays it locally. If the slave stops with error 1236, as shown below, how can we fix it…