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I want to configure postfix such that if a message from MAILER-DAEMON is not immediately deliverable, the message should be dropped/discarded rather than be deferred or handed off to my smtp fallback relay. Is there any way to accomplish this?

I have a Bind DNS caching-only server setup that is working. I am bringing up a new AD domain controller that will also be a DNS server for that AD but I don't want it responding to any DNS queries except those that are AD related. So, my goal is to leave this caching server as the primary DNS...

In my Postfix + Amavisd-new + Spamassassin setup, I am trying to bypass the content filtering for specific senders. Messages that match my header checks are producing an error in the maillog, "warning: connect to transport 127.0.0.1: No such file or directory" and the message just sits in the...

I am in the process of building an outbound SMTP gateway to filter messages generated from web forms. The setup I am using is Postfix + Amavisd-new + SpamAssassin. I currently have a Postfix + SpamAssassin setup in production but I find that releasing messages marked as spam is not practical...

I have a Postfix + SpamAssassin server acting as an outbound SMTP gateway to prevent my users from sending spam. Messages that have a high enough SPAM score get delivered to a local user account designated as spam. Well, I have a problem and some messages were incorrectly scored and got sent...

I have my root filesystem on /dev/sda1. I want to mount another volume, sdb1, to the /usr directory. Once I do that, how would I go about deleting the contents from the /usr directory on sda1 other than booting the computer to a rescue disk (the computer is in a remote location and there is...

I have an apache server with multiple virtual hosts and I would like to configure the owner of the files & directories for each virtual host to be different from each other (which will not be the user apache), similar to how cPanel or Plesk is setup. But the closest I can get is with suexec and...

I want to search a text file for the existence of certain strings and execute a command if they exist, something along the lines of: if <string> exists command or if <any member of this list exists> command Any suggestions? I know how to manually search a file with grep, cat, etc...

I am trying to setup a Linux Virtual Server system on CentOS 5.4 i386, following the documentation here. I am trying to start the pulse service and am getting an error, "Starting pulse: pulse: error parsing /etc/sysconfig/ha/lvs.cf at line 16: invalid argument". The line in question is the line...

I have a PHP application that sends email reports. The script runs under the account some_user and the email message arrives as being from some_user without a "@domain" suffix. The server is running sendmail as an MTU. Can sendmail be configured to add the domain suffix to the sender prior to...

Is it possible to do both pre-queue and post-queue content filtering? What I want to do is have a pre-queue filer that does DNSBL checks, and a post-queue that does additional spam and virus checks. My reasoning is that if a sender is on a DNSBL, I don't want the message to ever get into the...

Has anyone tried using non-Dell approved hard drives in a server or enclosure connected with a Dell PERC 6 RAID controller? I'm considering buying a PowerVault MD1000 and I don't want to buy the hard drives from Dell, but the documentation for the PERC 6 RAID controller said that it only...

I have a route based VPN tunnel setup between two Netscreen 100s running ScreenOS 4. Computers on the remote site have two NICs, one with a public IP address connected directly to the internet and one with a private IP address on an isolated LAN. Other than the Netscreen device, this network...

I have a server with a PERC 4e/Di RAID controller with a RAID 5 array. One of the 73GB drives failed so we replaced it with a 146GB drive of the same speed (knowing that it's only going to use 73GB of its space). However, the Dell OpenManage Administrator is showing the 146 drive as being in a...

I have a Netscreen 100 running ScreenOS 4.0. I generated a new private/public key pair from the CLI but in the WebUI under Configuration > Admin > Management, no certificates are in the drop down list. Any suggestions on what I need to do?

I want to header checks based on multiple conditions for a single action, but it is not clear to me how to ensure that all conditions are met before the action takes place. What I am trying to accomplish is this: if sender=some_sender and recipient=some_recipient and subject=some_subject then...