Brilliant, deanishe! This worked perfectly.
If you're a beginner like I am, you might want to see the step-by-step of how I implemented it (for those who are curious).
In Alfred, go into the Workflows area, click the [+] in the lower left-hand corner and select "Blank Workflow"
Give your new Workflow a title (I chose "My Email Greetings") and click [Save]
Right-click on the main working area (where the Alfred components go) and select: Input » Keyword
Choose a proper keyword and write a title for your workflow – I chose "greetings" for the keyword and "Email Greetings and Phrases" for the title.
Make sure to choose "No Argument" and click [Save]
Right-click on the main working area and select: Actions » Run Script
In the pop-up that appears, change the Language to /usr/bin/python as deanishe noted above
Paste in deanishe's script above into the script area, making sure to remove the default 'query' content that was in the text area. Click [Save]
Right-click on the main working area and select: Output » Copy to Clipboard
On the pop-up window that appears, optionally check the box next to "Automatically paste into front-most app." I chose to do this so when I run my email greetings it will automatically put the text into my new email when I run the app. Click [Save]
Connect the Keyword to the left side of the Run Script component
Connect the right side of the Run Script component to the left side of the Copy to Clipboard component
Open up a text file or email and test it out with the keyword "greetings" (or whatever you chose)
If you're satisfied, then go in and change the sentences in the Run Script
If you're really satisfied, buy danishe a beer using the link in his signature!