The printer was sent the file from the wrong email, and it was the version before the approved one.
The printer gets the approved file, and only that file.
Once the client approves, the supplier is emailed a link that opens the approved file and nothing else. You record the proof, production and dispatch, and the client confirms what arrived.
What it looks like now
The client wanted to see the proof, and nobody can say afterwards which proof they saw.
Whether the job arrived is a phone call, not a record.

What you get, and where it shows up
Only the approved file leaves
The supplier’s link opens only the approved file. Nobody attaches the wrong version to an email, because nobody attaches anything.
More on thisProof, production, dispatch
You record each in turn, dispatch with its tracking. Where the job says so, the client signs off the proof by link, and a proof they asked changes to cannot be sent back.
More on thisEvery job, by stage
Brief, studio, client, production, delivery. Each job shows where it is, and the client confirms receipt through a link, with the address and time on the record.
More on thisWhere you work in it
Hand the approved file to the supplier by link, then record proof, production and dispatch.
Spend RequestsOperationsProduction spend checked against the budget before it is approved, with the supplier’s quote attached and the invoice added when it arrives.
ProjectsProject managementJobs and tasks in columns, with who moved each card on the trail.
Where to next
Rounds of changes, the version they make, and the path to print or files, with the client’s proof sign-off on or off.
Show the client one file, and keep their answer.You own the client and what was sold. Koldheim sends each artwork version to the client through a link that shows that version only, pins their answer to the file they saw, and keeps every estimate revision.
Nothing reaches the client without your sign-off.Every upload is the next version, and each one comes to an art director before the client sees it. Changes go back to the artist with your comment, and nobody signs off their own work.
No spend without the right signature.Requests arrive priced from stock, with the department budget in front of the approver. Over your threshold, a second signature is required before anything moves.