Email that gets the inspection report to the buyer and the fleet invoice past accounts payable.

A driveway battery swap ends with a text receipt and nobody minds. The higher-value work in this trade runs on documents. A pre-purchase inspection is worth nothing if the report reaches the buyer after the seller has taken another offer, or lands in a junk folder because a free webmail account sent it with an attachment. A fleet account expects a monthly statement, a report for each van and an invoice in a format its bookkeeper can process, sent to an accounts payable address that filters unknown senders hard.

Commercial customers also ask for paperwork before the first job. A property manager who lets you work in a tenant lot, or a contractor whose trucks you maintain in its yard, will usually want a certificate of insurance naming them and a W-9 for their vendor file. Sending those from a company address on your own domain, with the right names on them, is part of getting approved as a vendor. Sending them from a personal address with a nickname in it raises the question you are trying to answer.

Parts are the third stream. Supplier accounts, online orders, return authorizations and core credit memos all arrive by email. When they land in one tech's personal inbox, the core credit nobody claims and the warranty part nobody returns are money you never see. A parts inbox the office can read fixes that without anyone changing how they order.