Generating email address images

Nowadays, you can't publish an email address anywhere without receiving a bunch of spam immediately after. Those spam web crawlers just search in every site looking for everything and anything that resembles an email address.

I very often see people use different variations of writing their email like "myname at mydomain.com" or "myname at mydomain dot com".
I don't think this covers it anymore...
The best way, in my opinion, is to create an image of the email address instead of writing it. (That's what Facebook does as well.)

I started working on a user based site, and the users' emails will be displayed throughout the site. So I created a class that will dynamically generate email address images for me so my precious users won't be so vulnerable to all the spam out there.

Here it is:

// Members //
private int _emailFontSize = 8;
private string _emailFontFamily = "Verdana";
private Brush _emailBackgroundColor = Brushes.White;
private Brush _emailFontColor = Brushes.Navy;

// Properties //
// I cut this out, just for convenience //

// Methods //
public void CreateEmailImage(string email)
{
// create the font object
Font myFont = new Font(_emailFontFamily, _emailFontSize);

// create the image object
Bitmap emailImage = new Bitmap((int)(myFont.SizeInPoints * email.Length),
myFont.Height);

Graphics imgGraphics = Graphics.FromImage((Image)emailImage);
imgGraphics.FillRectangle(_emailBackgroundColor,
new Rectangle(new Point(0, 0), emailImage.Size));
imgGraphics.DrawString(email, myFont, _emailFontColor, new PointF(0, 0));

// measure the actual size of the email string
SizeF stringSize = imgGraphics.MeasureString(email, myFont);

// crop the image we created
Bitmap finalImage = CropImage(emailImage,
new Rectangle(new Point(0, 0), new Size((int)stringSize.Width,
(int)stringSize.Height)));

// save the image to a local file
finalImage.Save(email + ".gif", ImageFormat.Gif);
}

private Bitmap CropImage(Image imgCrop, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(cropArea.Width, cropArea.Height - 1);
Graphics bmpG = Graphics.FromImage(bmpImage);
bmpG.DrawImage(imgCrop, new Point(0, 0));
return bmpImage;
}
}