What is DKIM?

There are several factors when it comes to determine precisely the legitimate of a mail and the source. RFC’s 5585, 5863 and 4871 define the DomainKeys Identified Mail (DKIM) protocol in order to make this process easier.

The official DKIM definition is:

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Reset password IMSVA

Changing password for user: admin
[root@IMSVA-1 ~]# /opt/trend/imss/PostgreSQL/bin/psql imss sa -c “update tb_administrator set md5_digest=′f859fc47dd1efd1a2b131344106cbab9′ where admin_name=′admin′;”
After this change, the password will be de default “imsva8.0” (without the quotes)
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The VMWare Authorization Service is not running

This error occurs everytime you want to power on a Virtual Machine on VMWare Workstation under Windows Vista, 7.

To have your VMWare Workstation working you have to navigate to:

  1. Start -> Control Panel -> Computer Management -> Local Users and Groups -> Users
  2. Right Click the user “__vmware_user__” and select properties.
  3. In the “Member of” Tab click the button Add.
  4. Type the “Administrators” group in the new Window
  5. Click Ok, to leave all the windows.
  6. Go to Start -> Control Panel -> Administrative Tools -> Services and look for the VMWare Authorization service
  7. Select the service. Right click on it and select Start.

Now start your Virtual Machine, everything will be ready now!


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Installing ESXi 5 on VMWare Workstation 8.0

VMware virtualization technology is one of the most actually in use given the compatibility of many applications and virtual appliances and because of the efficient resource utilization it gives.

VMWare ESXi installation is fully supported since version 7.0 of VMWare Workstation, nevertheless, it is until version 8.0 that you can actually create x64 virtual machines inside a virtual ESXi server. Continue reading

Why can’t you erase when sending a mail from the command line?

[Leer este post en Español]

You may have need to erase some character when sending a mail from the command line (specially in Windows CMD) because of any kind of mistake, but instead of making the correction you realize an error code shows up.

The reason for this is that in SMTP you can only transfer a very limited US-ASCII charset. Any other unrecognized character will not be recognized by the SMTP Server. When you press the “Back” key to correct you rmistake, what you are really doing is sending the corresponding ASCII code for that key and this is why your command ends up with an error code. Continue reading

How much time can a mail remain queued?

[Leer este post en Español]

There is always a time limit a mail can remain queued before deletion, no matter what the reason for the queuing is.

This time is defined by each mail server and in some cases it can be easily configured. For example: Postfix determines this behavior by checking the following parameter in main.cf

[root@cent01 mail]# postconf maximal_queue_lifetime
maximal_queue_lifetime = 5d Continue reading