Tag: mac os x

Mountain Lion Server: Disable Greylisting

Greylisting. Was it ever a good idea?ServerCenter

Well, some say so.  Greylisting (detailed at Greylisting.org) is a spam prevention technique for mail servers.  The concept is simple:

– When your mail server receives a message from a new sender, the server temporarily rejects the message with a “try again later” or “delay” message.

– Most outgoing mail servers (senders) will indeed try again.  Sometimes this doesn’t occur for a while, though.  15 minutes, 30 minutes, a hour….longer.

– When the message is sent again, it’s cleared and delivered to the user.

Most spammers don’t get this option.  Spammers are smart, though! They know this trick. So, was this ever a good idea?  Maybe.  Is it useful now?  I say no.

Disable Greylisting on Mac OS X Mountain Lion Server

Open Terminal on your server and execute the following command:

Select Code
sudo serveradmin settings mail:postfix:greylist_disable = yes

You can restart the Mail server, as needed.


You’re done.  Comment here if you have any challenges using this command.


“Lock Desktop” – New Mac OS X App

I’ve uploaded one of my first applications for a Mac. It’s extremely easy to use. The tool allows you to lock your desktop when you’re away from the computer and requires a password when you get back.  This is something you can run on demand, instead of waiting for a screen-saver, or logging off.  Lock Desktop 1.0 even keeps your programs running in the back.  Read more →