Help! My sister requested a certain kind of vanilla from Mexico which I can get through a catalog. Can you send liquid through the mail? I tried to find out at the USPS site but couldn't find anything. I seem to remember seeing it posted at the post office in the list of restricted things. Does anyone know? I'd call the post office, but it's Sunday. I could just have them send it to her house, but that spoils the fun of wrapping it, etc.