Instead of an e-mail provider giving you your_name@mailprovider.com, let them give you *@your_name.mailprovider.com, and all messages to the domain get delivered to the same inbox. This allows powerful filtering for spam on receipt by providing different e-mail addresses to different senders.
The user interface should provide a means to (by default) reply from the address it was sent to.
The problem with plus-addressing on the left hand side of the "at" sign is a malicious or incompetent sender can drop the "plus" sign.
SecureID like dongle for generating permissable addresses.
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