I sent a big envelope and only put a 1st class stamp on it. What will happen to the

mia.et_al

New member
letter? I need some advice. I sent a big envelope off today and only put a 1st class stamp on it. Now my friend has told me that this is not enough anymore to send big letters. By the way I am from the UK.

What will happen to my letter now? Will they still send it but second class instead? Or will they return it to me? [my address is on the back of the letter]
 
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