I thought about this and came to the conclusion that while there might not be the perfect solution to this problem, there are a few things which every company could do to at least alleviate the problem.
1) Automatic replies: It would help customers if they knew that their email has arrived. Automatic replies to spam would bounce but the bounced mails could be sorted out automatically
2) When ordering every customer has to give their email address (for confirmations, delivery notifications, etc.). As the customer has to give their credit card details upon ordering it is safe to say that those email addresses will not be used for sending spam as the owner of that address can be easily tracked. So why not whitelist one's own customers' email addresses? That could be done automatically and in case servers like Hotmail are temporarily blacklisted the customers emails would still get through as they are whitelisted.
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