A new address should solve a specific problem
If you work alone and most invoices reach one well-managed mailbox, moving every supplier may not be the first useful step. First establish where documents actually go missing. You might discover three portals and two travel receipts cause the trouble — things a new email address cannot obtain anyway.
A separate contact helps mainly when invoices reach several people, administrators change, or personal and business communication are hard to separate. The supplier then has a stable address that survives a particular colleague's departure. Someone must still be responsible for running it.
Before creating the address, decide whether you need a separate inbox, an alias for an existing address, or another way to receive mail. Suppliers will not see the difference, but sign-in, colleague access, and delivery will work differently.
Who notices something has not arrived?
Choose someone to look after the address and handle problems. They should know what to do about failed delivery, orders under another account, or lost access. Routine PDF sorting can still be automated.
Receiving invoices and processing them for accounting are different tasks. An accountant can receive selected records without managing the whole mailbox and every other message. If other people have access, use your provider's access-management features; sharing one password is rarely a good foundation for cover during absence.
Test an ordinary absence too. If you are away for a week, can someone else identify the latest handover and outstanding documents? If every connection stays in your head, the new address has not solved this problem.
Move suppliers one at a time and check the result
Start with services that send invoices regularly. Change each one's contact details and watch the next actual document. Not every setting called “email” is for billing: it may control login, notifications or marketing. Only the correct delivery confirms the correct change.
Keep watching the original location during a transition. A supplier may use the old address for an existing order or store the billing contact separately. Forwarding or another rule may help, but must remain understandable so the same document does not circle through mailboxes repeatedly.
For several companies, check the buyer too. One billing address may receive documents for several entities, but they should not automatically go to one accountant. Invoice content still needs correct classification.
When only notifications reach the mailbox
In the example, you moved an online service's contact. A monthly charge notification now arrives, but no PDF. The address is configured correctly; the supplier simply provides documents only in its portal.
Note that exception and choose who obtains the document. If actual invoice emails can be enabled, verify that separately. If not, add the service to a short list of sources outside email. You do not need to check spam every month hoping the missing attachment appears.
Recognise whether the address actually helps
After the first handover, check whether you have fewer places to search and clearer exceptions. If you have merely created another mailbox alongside all the original ones, finish the supplier changes or simplify the process.
A separate email should give invoices a stable route. Its benefit appears when you no longer search with a former colleague, administration can be covered and the accountant receives the right records. The message count in a new mailbox is not a measure of order.