A Relay Service, asking to book multiple appointments at a business.
Since it is too busy to accommodate over the phone, person asks over Relay Service for an email address.
After replying to initial email, person wants to set up credit card payment in advance to pay over $1,000 for services and have me responsible for payment to a third party (even though services are only $195).
Phone number came through our call waiting.
Email address is a Yahoo! address.