How to fix "Service unavailable from cause of too many queries to uribl.com"
If Zimbra cannot receive email while sending works normally, check the log for a message like this: zimbramail postfix/smtpd[xxx]: NOQUEUE: reject: RCPT from mailx.ezylin
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389 notes on Linux, tools and troubleshooting
Enable SFTP logging transfer
SFTP, installed with OpenSSH, does not normally log activity. To log access and file changes, configure its Subsystem settings.
Find out which processes are using swap space
A script to identify processes using SWAP on a server. It displays process details and the amount of swap space each process uses. #!/bin/bash # Get current swap usage for all
How to resolve yum error [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host"
After installing CentOS, yum installs or updates may fail with "[Errno 14] PYCURL ERROR 6 - "Couldn't resolve host"", as in the example below: http://mirrors.psu.ac.th/pub
How to fix error: 97: Address family not supported by protocol on Zimbra
When starting the zimbra service, you may encounter the error message below: Starting nginx...nginx: [emerg] socket() [::]:7143 failed (97: Address family not supported by protocol) failed. Starting mta...Faile
How to fix "wget: unable to resolve host address" issue
If wget reports unable to resolve host address, first test network connectivity, then check whether wget is trying IPv6 on a machine without IPv6 access.
How to check mailbox usage of all accounts in Zimbra mail server
A script for checking disk usage on a Zimbra mail server. This check mailbox usage script reports the space used by each user, the assigned Quota, and each user's status.
How to change HELO message in Zimbra Mail Server
To change SMTP HELO on a Zimbra server to match the configured MX record, follow the procedure below. Log in as the zimbra user. [root@EzyMailHosting ~]# su - zimbra Change the SMTP HELO setting...
Monitor multiple logs in a single shell with MultiTail
tail is widely used for viewing logs in real time (tail -f /var/log/logfile). MultiTail provides similar functionality with multiple windows in one console.