Invalid SSL Certificate in Apple Mail

It is new security feature in Mac OS X, by default only apps from Mac Store & from trusted developers are allowed to run there. Fortunatelly, it is easy to change, you have to allow this in Mac OS X preferences.

Go to Preferences -> Security & Privacy and click on padlock to allow changes.

Then in "Allow appications downloaded from" select "Anywhere". cate-on-os-x-mountain-lion

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