Can you send something larger than a standard envelope through a cluster mailbox (outgoing mail)?

I want to send a small package through my cluster mailbox in my community (a manila envelope is a decent reference), and I wanted to confirm that I c

I want to send a small package through my cluster mailbox in my community (a manila envelope is a decent reference), and I wanted to confirm that I can do so before taking the risk and trying it out. The outgoing slot would fit the envelope I'd like to send, but I'm not sure if that qualifies it.

or:I want to send a small package through my cluster mailbox in my community (a manila envelope is a decent reference), and I wanted to confirm that I can do so before taking the risk and trying it out. The outgoing slot would fit the envelope I'd like to send, but I'm not sure if that qualifies it.

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