Contact
One address, read by a person, usually answered within a couple of days.
[email protected]
For refunds, quote the address you bought with — the terms are on the refunds page.
If you are writing to tell us a card is wrong, that is the most useful email this site gets. Say which card and what you saw happen instead. Corrections go out free to everyone who bought the pack and are logged in the changelog.
If you are a Japanese speaker willing to check register on a set of cards, please say so — that is the work standing between the current drafts and a finished product, and it is described on how cards are checked.