Postfix restart in Mac OS X 10.8 Mountain Lion

October 14, 2012 - 1:09pm - by admin

Actually it is no so easy to restart Postfix in Mac OS X 10.8 Mountain Lion like in Linux :-)

However you can restart Postfix by plist unload / reload:

sudo launchctl unload /System/Library/LaunchDaemons/org.postfix.master.plist

sudo launchctl load System/Library/LaunchDaemons/org.postfix.master.plist

By the way, if you have a problem with Postfix, look at this article: Cannot send mail in Mac OS X 10.8 Mountain Lion

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How to Flush DNS Cache in Mac OS X

October 11, 2012 - 6:31pm - by admin

After upgrading to 10.8.2 I have got a problem with adding a new entry into hosts file: the update was recognised only after system restart. But a more easy solution was just to flash DNS cache! So,

... flushing your DNS cache in Mac OS X is actually really easy, and there are two different commands to use, one for Leopard and for Tiger. Depending on your version of OS X, open your Terminal and follow the appropriate directions below:

Flushing DNS Cache in OS X Lion (10.7) and OS X Mountain Lion (10.8)

Launch Terminal and enter the following command, you will need to enter an administrative password:

sudo killall -HUP mDNSResponder

Note the dscacheutil still exists in 10.7 and 10.8, but the official method to clear out DNS caches is through killing mDNSResponder. You can also find that process running in Activity Monitor.

Flush DNS Cache in Mac OS X 10.5, Mac OS X 10.6

Launch Terminal and issue the following command:

dscacheutil -flushcache

All done, your DNS has been flushed. On a side note, the dscacheutil is interesting in general and worth taking a look at, try the -statistics flag instead for some stats.

Flush your DNS Cache in Mac OS X 10.4 Tiger

Type the following command in the Terminal:

lookupd -flushcache

That’s it - now your DNS settings should be as you intended them to be :-)

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Cannot send mail in Mac OS X 10.8 Mountain Lion

August 12, 2012 - 4:21pm - by admin

There is an error while sending mail in Mac OS X Mountain Lion 10.8:

send-mail: fatal: chdir /Library/Server/Mail/Data/spool: No such file or directory

To fix just run in terminal:

sudo mkdir -p /Library/Server/Mail/Data/spool

sudo /usr/sbin/postfix set-permissions

sudo /usr/sbin/postfix start

The solution also fixes an error in 10.8 where the fax service has stopped sending emails after the 10.8 upgrade.

Another Postfix Mac OS X issue solution can be found here: Mac OS, MySQL: No such file or directory (trying to connect via unix:///var/mysql/mysql.sock)

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