Mail.app has a handy feature that lets you only quote a specific section when replying to an e-mail.
To accomplish this, select the block of text you want to quote:

Click reply and you’ll have a new message with only the selected text quoted:

This is great when CC’ing someone without showing them the entire e-mail–only the part [...]

earthlingsofts‘ Mailboxer is one of the great Mail.app add-ons available for keeping all your emails neat and organized. It takes any list of contacts that you provide it with and magically creates a smart mailbox for each one that includes all emails on your computer that somehow involve them.
Download and run Mailboxer, and you will [...]

If you scroll over a contact in Mail, a little arrow will appear in the bottom-right corner. If you click the arrow, you can perform a number of actions using the contact such as “Search in Spotlight”.
One of the more useful features is the ability to create a smart mailbox that automatically collects all the [...]

One frustrating thing about using Gmail for mail is clicking e-mail addresses won’t take you into Gmail. Fortunately, there’s two different ways you can accomplish this.
Google Notifier
The first and easiest method is using Google Notifier for OS X, which adds a Gmail icon in your menubar:

The Google Notifier is nice because it notifies you of [...]

Mutt is one of the best email clients out there, it’s fast, efficient, you can keep your fingers on the keyboard, it has key bindings and macros, threading, regular expression, pattern matching and more.

With a little tweaking you can get Mutt to also integrate into the Mac environment, for example here’s how you can get [...]

Mutt is the greatest mail client on any platform. It’s quick, simple,
extensible and configurable, you can use your favorite editor for writing
emails and more. However one bad thing is that by default you can’t set it
as your default email [...]

Apple Mail is one of the better desktop email clients I have worked with. It rarely feels bloated, works well with other OS X applications, and has many features not available on most web clients. One great thing in Mail is the ability to be very specific with the format of text, from font and [...]

Sometimes, the whole system of attaching a file can be quite tedious because you have to look up the file you wish to attach, even if it’s sitting right on your desktop. Here’s a quick tip that will skip all the tedious browsing required to attach a file.

If you drag a file on to [...]

Alcor (nickname for the developer of Quicksilver)
is
compiling a huge list of user defaults. User defaults
include things like if you want the Safari debug menu to show up, if you want the dock to [...]

To apply a festive them to that boring email message of yours, simply click “Show Stationary”, in the upper right hand corner, right next to Photo Browser. Then you can choose from dozens of premade templates, or you can create your own custom photo template by clicking on the Photos category.