Do you avoid Gmail due to privacy concerns? Your resistance is futile. Benjamin Mako Hill has hosted his own email for the past 15 years, and despite that, he found that over half of his email messages either come from or go to a Gmail account, where they can be analyzed by the search giant’s automated algorithms. Of course, the same is roughly true of other large mail hosting firms, so although the mail you send isn’t likely to allow these companies to target ads at you better, it’s far from being a private communication between you and the recipient. follow link
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.
You Can’t Escape Gmail
So, really, the smart thing to do is to think about email as a postcard, where the mailman or any of the mail sorting clerks can easily read it, not a sealed letter. Sending the email equivalent of a sealed letter requires that both the sender and recipient use encryption.
Facebook just last week posted about how they use it and how many servers they send mail to accept it. It's a lot of them. And more than half even support Perfect Forward Secrecy.