Verify the message before moving it
You have found a supplier’s invoice in Gmail’s Spam folder. Verify where it came from, then recover it and check whether a blocked address affects subsequent deliveries. These instructions are for Gmail in a desktop browser.
Before changing anything, inspect the actual sender address and any Gmail warning. A familiar company name or logo does not establish authenticity. If you were not expecting the invoice or it asks you to do something unusual, check with the supplier through your usual contact. Do not mark a suspicious message as safe just to get the document into your inbox.
If you are unsure where the message came from, check it using the guide below first. Continue only once you have verified the message.
A suspicious invoice arrived. What to check before you respond →
Source for this section: Google: Protection against phishing
Recover the individual invoice from spam
Open Spam in Gmail’s left-hand panel. Expand the additional folders if you cannot see it. Select the verified message and mark it as not spam. Google’s English help calls this action “Not spam”.
This recovers the invoice you found. Also check whether you previously blocked the sender: recovering one message does not unblock the address.
Do not leave older messages there for long: Gmail automatically deletes spam after 30 days. Emptying the folder manually can delete it sooner.
Source for this section: Google: Block and unblock senders · Google: Legitimate messages in spam · Google: Missing Gmail messages
Choose the action that matches what you find
A blocked address, an invoice classified as spam and a filter that keeps mail out of your inbox need different actions. Choose the relevant branch based on what you actually find in Gmail.
| What you found | What to do | What this addresses |
|---|---|---|
| The supplier’s actual address appears in your blocked-address list. | After verifying the sender, unblock the address and mark the invoice as not spam. | Removes your own block; check the next delivery as well. |
| The verified invoice is in spam, but the address is not blocked. | Mark that message as “Not spam”. Contact your supplier if it keeps happening. | Corrects the classification of the message you found; recurring problems may need the sender’s help. |
| The message is not in spam and matches a filter that archives or deletes it. | Review the relevant filter and change or remove the unwanted action. | Addresses an inbox rule, rather than spam classification. |
Source for this section: Google: Block and unblock senders · Google: Legitimate messages in spam · Google: Missing Gmail messages
Check blocked addresses and mail rules
In Gmail on a computer, open Settings, go to the full settings and find “Filters and Blocked Addresses”. Look for the invoice’s actual sender address in the blocked-address list. Unblock it if it belongs to the supplier you have verified. Gmail sends subsequent messages from blocked addresses to spam.
After unblocking, check where the next invoice arrives. Messages may still land in spam, so changing the setting does not yet prove the problem is resolved.
If the missing message is not in spam, check filters on the same settings tab. A rule may archive a message, skipping the inbox, or delete it. Check both the criteria and action of the individual rule; avoid changing every setting at once.
Gmail invoice filters: stop searching for the same supplier →
When searching outside the inbox, include spam and trash. The guide below includes a search tool. An empty result does not prove the supplier sent nothing.
Find invoices in Gmail: a guide and search query builder →
Source for this section: Google: Block and unblock senders · Google: Legitimate messages in spam · Google: Missing Gmail messages
Record where the next invoice arrives
When the next invoice arrives, note the message date, actual sender address, where it arrived and any Gmail warning. Also record whether you previously unblocked the address or only marked one message as “Not spam”.
If the next invoice lands in spam again, send these details to the supplier through your usual contact. For a business mailbox, you can also involve your email administrator. They will have a specific message to investigate rather than a general report that invoices are missing.
If Gmail warns that a message from a supplier you have verified is unauthenticated, give the supplier the warning details too. Missing authentication alone does not mean spam, and an authenticated message is not guaranteed to reach the inbox. Ask the supplier or their administrator to check the sending configuration.
Source for this section: Google: Email authentication
A message to your supplier if it happens again
The template below uses a fictional address and placeholders. Replace them with your message details, keep only actions you actually took and send it through a known supplier contact.
Fill in the date, actual sender address, action taken and exact Gmail warning. If there was no warning, say so.
Check the outcome on the next delivery
Recover the verified invoice from spam and remove any block on its sender. If a filter is hiding the message, adjust that specific rule. Check the next delivery; if it lands in spam again, use the template above to ask your supplier to investigate.