I am not sure if this is exactly the right section. What do you find the most efficient, clear and reachable use of e-mail addresses to use for the customer? I thought a standard 'sales, 'support' ...
I've recently released a site that presently integrates with PayPal for taking payments, this doesn't require you to hold a PayPal account as you can submit credit cards through the PayPal checkout ...
For one of my main customer help email addresses I use Mozilla Thunderbird with a combination of tags and saved searches. As the number of my e-commerce sites grows from 1 to more, customer service ...