Lei deve inviare la ricevuta entro lunedì.

From Lesson 297:Deadlines (entro)·Italian

Questions & Answers about Lei deve inviare la ricevuta entro lunedì.

Why use entro here instead of fino a for "by Monday"?
Entro is used to set a deadline for a single event, meaning "by" or "no later than". If you used fino a ("until"), it would suggest an ongoing action that continues right up until Monday, which doesn't make sense for a quick, one-time action like sending a receipt.
The English translation says "You must", but doesn't Lei mean "She"?
It can, but here Lei is capitalized, which indicates the formal "you". You would use this in a professional setting, such as when asking a client for a receipt. Because it's the formal "you", it requires the third-person singular verb form (deve instead of the informal devi).
Why isn't there an article before the day of the week, like entro il lunedì?
In Italian, using a day of the week without an article means you are talking about this upcoming day (this Monday). If you added the article and said il lunedì, it would mean "on Mondays" in a general, recurring sense. Since this is a specific one-time deadline, the article is left out.
Could I use mandare instead of inviare to say "to send"?
Yes, mandare and inviare both mean "to send" and are highly interchangeable. Inviare sounds just a little bit more formal or official, which perfectly matches the professional tone of using the formal Lei to talk about a receipt (una ricevuta).

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