This recipient requires postage

Your message to … was held because this is the first time you've written to them. Choose one of three ways through:

1 · Solve a free puzzle fastest

Your browser solves a small proof-of-work puzzle. No payment, no account. Usually takes a few seconds.

Done! Resend your email to this address instead:

Valid for 24 hours, for this message only.

Paste a stamp code. The value is held in escrow for 14 days and refunded automatically if the recipient doesn't accept your message.

Stamp accepted. Resend your email to:

Escrowed until . Refund credential: — keep it.

The recipient has been notified that your message was held and can whitelist you. If they do, just resend your original email later.