If the user who sent the card is logged in under that account then they should be able to see the card. It's not possible to send the passcode back with the conformation email though since the passwords are md5 encrypted for security.
No, adding quotes in the email phrase will not cause any problems.
For the smilies problem, if you'll look in your gallery/ecard.php file for this code:
Code:
Content visible to verified customers only.
And add this below:
Code:
Content visible to verified customers only.
Then that should take care of the problem.