There's not a way in the system to resend a gift certificate to a client if they lost or did not receive the original email. You can however copy the voucher code and email it to them separately.
1) Find the voucher under the Sales tab and copy the voucher code.
2) Go to Clients > Details and bring up the client's profile.
3) Click 'Send message', modify the template to indicate you're re-sending them their voucher code and then paste the code into the message. Click 'Send'.
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