[cflsystems]

You need to edit /skin1/modules/Gift_Certificates/customer/giftcert.tpl
Comment out this bit of code and see how it works

<tr>
<td colspan="3" class="giftcert-delivery-method">
{if $config.Gift_Certificates.enablePostMailGC eq "Y"}
<label>
<input type="radio" name="send_via" value="E" onclick="javascript: switchPreview();"{if $giftcert.send_via ne "P"} checked="checked"{/if} />
{$lng.lbl_gc_send_via_email}
</label>
{else}
<input type="hidden" name="send_via" value="E" />
{/if}
</td>
</tr>
<tr>
<td colspan="3" class="giftcert-subtitle">{$lng.lbl_gc_enter_email}</td>
</tr>
<tr>
<td class="data-name">{$lng.lbl_email}</td>
<td class="data-required">*</td>
<td><input type="text" name="recipient_email" size="30" value="{$giftcert.recipient_email|escape}" /></td>
</tr>