check_rbl

check_rbl is a handy Nagios plugin that helps you check if your SMTP server has been blacklisted. It's super useful for keeping your email running smoothly! If you're dealing with email issues, this tool can be a lifesaver.

What’s New in check_rbl 1.1.0?

The latest version of check_rbl, which is 1.1.0, can be found on its official page at here. This tool is free and comes with absolutely no warranty, so you can use it, share it, or even tweak it as per the GNU General Public License.

Why Check SMTP Blacklisting Status?

If you're managing an email server, it's crucial to know whether your IP is blacklisted. Being on a blacklist can prevent your emails from being delivered. With check_rbl, you can easily monitor this status.

How to Use check_rbl?

The usage is pretty straightforward! You can run the command like this:

check_rbl [--help] [--verbose] [--version] [--timeout t] -H hostname --server servername [--critical n] [--warning n] [--workers n]

Command Options:

• -?, --usage: Print usage information.


• -h, --help: Get detailed help screen.


• -V, --version: Show version info.


• --extra-opts=[< section >[< config_file >]]: Load extra options from a section or config file (you can repeat this).


• -c, --critical=INTEGER: Set critical warning for the number of blacklisted servers.


• -w, --warning=INTEGER: Set warning for the number of blacklisted servers.


• -s, --server=STRING: Specify the RBL server.


• -H, --host=STRING: Enter the SMTP server you want to check.


• -r, --retry=INTEGER: Number of DNS query attempts (default is 4).


• --workers=INTEGER: Choose how many checks to run in parallel.


• -t, --timeout=INTEGER: Set timeout in seconds (default: 15).


• -v, --verbose: Show more details for debugging (can be repeated up to 3 times).