Can't send e-mail to sales@zotero.org

I cannot send e-mail to sales@zotero.org, an address that is shown on the invoice web page. Looks like a configuration problem on Zotero's end. Here's the SMTP error message I received:

sales@zotero.org:
SMTP error from remote server for RCPT TO command, host: zotero.org (50.19.225.228) reason: 550 5.1.1 <sales@zotero.org>: Recipient address rejected: User unknown in virtual alias table
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