Email aliases

I started working for a small utility company, doing their bookkeeping and admin. They had their own custom domain already and I just set them up with a .gov email account. Might be overthinking this a bit but want to create a couple aliases to separate incoming mail. Would love some thoughts on this but here's what I'm thinking so far:

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@billing for customer-facing invoicing

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@office for general inquiries

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@admin for internal communications

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And I kind of think I should create a separate one to set up my account with their bank and maybe one for AP?