After some effort, and lots of help from people smarter than myself, I now have a new email address, which should be able to support the kind of message traffic I've been seeing lately.
The new address is firstname.lastname@example.org. The website has been updated to reflect the change, and the contact form now sends messages to the new address.
My goal is to make this a smooth transition rather than a jarring change. If you have an ongoing conversation with me at the old address, I will continue to respond from that address to avoid any confusion.
However, for new orders and inquiries, please contact me at the new address (or simply fill out the contact form -- your message will go to the right place).
Thank you for your patience!