If you want this behavior for most of your email, you can simply apply
mso-line-height-rule: exactly; at the
<body> level, instead of repeating it throughout the email code. One drawback is that this property can make Outlook crop images by the line height. If a 200px tall image is placed in element with a
mso-line-height-rule: exactly; is in effect, Outlook will only show the bottom 20px of the image.