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Thank you for posting in the Constant Contact community, this is a very professional email and I love the social links section.
The only suggestion I can make is to change the color in the tabs section, I think something like white would make those links stick out more from the green background color. Also I would suggest adding some padding to the image in the header so that the white space around the image is even all the way around.
Andrew _H already mentioned the blue text on green. Just wanted to add that people with low vision may not see the text at all due to the low contrast between the colors.
Since the green bar at the top spans the full width, set the green bar at the bottom to match.
Give some padding above "Let's Connect!"