Three mailbox labels that stick

Outcome

Done when: Labels (or folders) named Money, Customers, and Ignore exist in the shop mailbox; at least one rule/filter files a known sender into Ignore; a test message to yourself shows the right label; you can find last month’s invoice thread with search or one click.

Not done when: The sidebar looks busy, twelve nested taxonomies exist, or the agent “set up labels” but you never sent a test.

Where this runs

• Machine / account: Your PC browser, signed into the shop mailbox — preferably Fastmail on your domain. Gmail steps are included if that is still the temporary shop inbox.
• Time: About 25 minutes of attention. No long waits.
• You must be present for: Login, 2FA, and approving any rule that archives or deletes.

Before you start

• Shop mailbox already exists (you@yourdomain on Fastmail, or the Gmail you are migrating off).
• Written decision: folders vs labels in Fastmail (either works; pick one and stay). Default recommendation: labels if you want a message in Money and Customers at once; folders if you want Inbox empty.
• Money: zero for this guide.
• This touches only mail organization — not MX, not DNS, not billing.

If you still want twelve categories, stop. Three is the install. You can add a fourth later when a real pattern shows up twice.

What you keep

• Passwords / passkeys
• 2FA
• Cards and billing
• Legal identity on the mail account
• The words in any auto-reply (do not create one in this guide)
• Who may send as you@

What the agent may touch

• Creating the three labels/folders from your names
• Drafting filter/rule conditions for senders you already listed
• Exporting a text checklist of what was created

What the agent must not invent

• Extra labels “for completeness”
• Auto-replies to customers
• Forwarding rules to personal Gmail
• Deleting mail, or rules that delete

Walkthrough

1. Open the shop mailbox on the PC

• Who: You
• Do: Sign in to Fastmail (or Gmail) in your browser. Complete 2FA. Confirm you are in the shop account, not a personal one — check the address in settings.
• Verify: You see the inbox for you@yourdomain (or the intended shop address).

2. Create the three labels (Fastmail)

• Who: Agent (clicks) while you watch, or you
• Do: Fastmail → Settings → Labels (or Settings → Folders if you chose folders) → Create label / Create folder. Create exactly: Money, Customers, Ignore. No nesting.
• Verify: All three appear in the left sidebar.

Gmail variant: Gmail → left sidebar next to Labels → Create new label → name → Create. Repeat for all three. Do not nest.

3. File a few existing threads by hand

• Who: You
• Do: Pick five recent messages. Apply Money to anything about invoices, banks, taxes, processors. Apply Customers to real client threads. Apply Ignore to newsletters and store receipt mail you still need searchable. In Fastmail use the label control; in Gmail use the Labels button.
• Verify: Opening each label shows only what you expect.

4. Add one Ignore rule for a noisy sender

• Who: Agent drafts; you approve and save
• Do: Fastmail → Settings → Filters & Rules → Create rule. Condition: From contains the noisy sender’s domain (example: a store you order supplies from). Action: add/move to Ignore (and archive only if you explicitly want Inbox clear). Save.

Gmail: Search box → Show search options → From: that sender → Create filter → Apply the label: Ignore. Optionally Skip the Inbox. Create filter.

• Verify: A new message from that sender (or “also apply to matching conversations”) shows the Ignore label.

5. Add one Money rule (optional same day)

• Who: You
• Do: Same pattern for your invoicing tool or bank’s notification address → label Money. Do not auto-archive Money until you have lived with it a week.
• Verify: A payment receipt or invoice-sent notice lands with the Money label.

6. Refuse the rest

• Who: You
• Do: Delete any extra labels the agent proposed. Keep the list at three until a fourth category appears in Ignore or Inbox twice a week for two weeks.
• Verify: Sidebar shows Money, Customers, Ignore — and not a tree of hope.

Prompt to paste

Set up three mail labels (or folders) in my already-open shop mailbox web UI: Money, Customers, Ignore. Do not create any others. Do not change MX, DNS, forwarding, signatures, or billing. Do not create auto-replies. Do not delete mail.

If Fastmail: use Settings → Labels (or Folders if that mode is on). If Gmail: Create new label in the sidebar.

After labels exist, draft ONE filter/rule that sends a sender domain I will name into Ignore. Show me the condition and action; wait for my OK before saving. Then stop and report: labels created, rule saved or not, and anything you could not click because of 2FA or permissions.

Verify the whole job

1. Send yourself mail with subject Label test Money and apply Money by hand — or trigger the Money rule.
2. Confirm Customers still only has client threads you labeled.
3. Open Ignore and confirm the noisy sender rule worked once.

Backup

• What to copy: Screenshot or text list of label names and filter/rule conditions (Fastmail Filters & Rules; Gmail Settings → Filters and Blocked Addresses).
• Where it lives: A folder you own next to your mail export habit — not only inside the vendor.
• How often: When you add or change a rule; plus whenever you run a quarterly mailbox export.

When it breaks

Do not

• Build nested Work/Clients/Active/Waiting trees on day one
• Forward shop mail into personal Gmail “so labels are easier”
• Let the agent invent auto-replies or deletion rules
• Put passwords or 2FA codes in the paste prompt

Affiliate notes

None. This guide assumes a shop mailbox you already control (Fastmail on your domain, or temporary Gmail).

Last verified

• Date: 2026-09-09
• Ran on: Fastmail web Settings → Labels / Folders / Filters & Rules and Gmail desktop label + filter flows as documented by Fastmail Help and Google Help.
• Known drift: Menu names for Filters & Rules; Gmail’s “Create new label” control placement on narrow layouts.