Can will be changed by mail

I think there may be a bit of confusion here!

In general, "can" is a verb that means "to be able to" or "to have the ability to". It's not something that can be changed by mail.

However, if you're asking if a "can" (as in, a container) can be changed by mail, the answer is yes! You can send a can through the mail, but it would depend on the type of can and the shipping method used. For example, you can send a can of food or a can of soda through the mail, but you would need to follow specific guidelines and regulations to ensure it arrives safely.

If you could provide more context or clarify what you mean by "can", I'd be happy to help further!