Gmail

Troubleshooting

If requests fail, run zero doctor check-connector --env-name GMAIL_TOKEN or zero doctor check-connector --url https://gmail.googleapis.com/gmail/v1/users/me/profile --method GET

User Profile

Get Profile

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/profile" --header "Authorization: Bearer $GMAIL_TOKEN"

Messages

List Messages

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages?maxResults=10" --header "Authorization: Bearer $GMAIL_TOKEN"

List Messages with Query

Search using Gmail query syntax:

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages?q=is:unread&maxResults=10" --header "Authorization: Bearer $GMAIL_TOKEN"

Common queries:

• is:unread - Unread messages
• from:example@gmail.com - From specific sender
• subject:hello - Subject contains "hello"
• after:2024/01/01 - After date
• has:attachment - Has attachments
• label:INBOX - In inbox

Get Message

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}" --header "Authorization: Bearer $GMAIL_TOKEN"

Get Message (Metadata Only)

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}?format=metadata&metadataHeaders=From&metadataHeaders=Subject&metadataHeaders=Date" --header "Authorization: Bearer $GMAIL_TOKEN"

Send Email

# Encode subject using RFC 2047 MIME encoding for non-ASCII characters
ENCODED_SUBJECT="=?UTF-8?B?$(printf '%s' "{subject}" | base64 -w 0)?="

# Create RFC 2822 message and base64url encode
RAW_MESSAGE=$(printf "To: {recipient-email}\r\nSubject: ${ENCODED_SUBJECT}\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n{body-text}" | base64 -w 0 | tr '+/' '-_' | tr -d '=')

Write to /tmp/gmail_request.json:

{
  "raw": "$RAW_MESSAGE"
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/messages/send" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Reply to Thread

# Encode subject using RFC 2047 MIME encoding for non-ASCII characters
ENCODED_SUBJECT="=?UTF-8?B?$(printf '%s' "Re: {original-subject}" | base64 -w 0)?="

# Include In-Reply-To and References headers for proper threading
RAW_MESSAGE=$(printf "To: {recipient-email}\r\nSubject: ${ENCODED_SUBJECT}\r\nIn-Reply-To: <{original-message-id}>\r\nReferences: <{original-message-id}>\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n{reply-text}" | base64 -w 0 | tr '+/' '-_' | tr -d '=')

Write to /tmp/gmail_request.json:

{
  "raw": "$RAW_MESSAGE",
  "threadId": "{thread-id}"
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/messages/send" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Modify Message Labels

Write to /tmp/gmail_request.json:

{
  "addLabelIds": ["STARRED"],
  "removeLabelIds": ["UNREAD"]
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}/modify" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Trash Message

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}/trash" --header "Authorization: Bearer $GMAIL_TOKEN"

Delete Message Permanently

curl -s -X DELETE "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}" --header "Authorization: Bearer $GMAIL_TOKEN"

Threads

List Threads

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/threads?maxResults=10" --header "Authorization: Bearer $GMAIL_TOKEN"

Get Thread

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/threads/{thread-id}" --header "Authorization: Bearer $GMAIL_TOKEN"

Trash Thread

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/threads/{thread-id}/trash" --header "Authorization: Bearer $GMAIL_TOKEN"

Labels

List Labels

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/labels" --header "Authorization: Bearer $GMAIL_TOKEN" | jq '.labels[] | {id, name, type}'

Create Label

Write to /tmp/gmail_request.json:

{
  "name": "{label-name}",
  "labelListVisibility": "labelShow",
  "messageListVisibility": "show"
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/labels" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Delete Label

curl -s -X DELETE "https://gmail.googleapis.com/gmail/v1/users/me/labels/{label-id}" --header "Authorization: Bearer $GMAIL_TOKEN"

Drafts

List Drafts

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/drafts" --header "Authorization: Bearer $GMAIL_TOKEN"

Create Draft

# Encode subject using RFC 2047 MIME encoding for non-ASCII characters
ENCODED_SUBJECT="=?UTF-8?B?$(printf '%s' "{subject}" | base64 -w 0)?="

RAW_MESSAGE=$(printf "To: {recipient-email}\r\nSubject: ${ENCODED_SUBJECT}\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n{body-text}" | base64 -w 0 | tr '+/' '-_' | tr -d '=')

Write to /tmp/gmail_request.json:

{
  "message": {
    "raw": "$RAW_MESSAGE"
  }
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/drafts" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Send Draft

Write to /tmp/gmail_request.json:

{
  "id": "{draft-id}"
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/drafts/send" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Delete Draft

curl -s -X DELETE "https://gmail.googleapis.com/gmail/v1/users/me/drafts/{draft-id}" --header "Authorization: Bearer $GMAIL_TOKEN"

Attachments

Get Attachment

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}/attachments/{attachment-id}" --header "Authorization: Bearer $GMAIL_TOKEN" | jq -r '.data' | base64 -d > attachment.bin

Settings

Get Vacation Settings

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/settings/vacation" --header "Authorization: Bearer $GMAIL_TOKEN"

Update Vacation Settings

Write to /tmp/gmail_request.json:

{
  "enableAutoReply": true,
  "responseSubject": "Out of Office",
  "responseBodyPlainText": "I am currently out of office.",
  "restrictToContacts": false,
  "restrictToDomain": false
}

Then run:

curl -s -X PUT "https://gmail.googleapis.com/gmail/v1/users/me/settings/vacation" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

List Filters

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/settings/filters" --header "Authorization: Bearer $GMAIL_TOKEN"

Create Filter

Write to /tmp/gmail_request.json:

{
  "criteria": {
    "from": "{filter-email}"
  },
  "action": {
    "addLabelIds": ["TRASH"],
    "removeLabelIds": ["INBOX"]
  }
}

Then run:

curl -s -X POST "https://gmail.googleapis.com/gmail/v1/users/me/settings/filters" --header "Authorization: Bearer $GMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/gmail_request.json

Common Scopes

Scope	Permission
gmail.readonly	Read-only access
gmail.send	Send emails only
gmail.compose	Create drafts and send
gmail.modify	Read, send, delete, manage
gmail.labels	Manage labels only
gmail.settings.basic	Manage basic settings
gmail.settings.sharing	Manage sensitive settings

Use full URL: https://www.googleapis.com/auth/gmail.modify

Decode Message Body

Gmail returns message body as base64url encoded. To decode:

curl -s "https://gmail.googleapis.com/gmail/v1/users/me/messages/{message-id}" --header "Authorization: Bearer $GMAIL_TOKEN" | jq -r '.payload.body.data // .payload.parts[0].body.data' | tr '_-' '/+' | base64 -d

Guidelines

1. Rate Limits: Gmail API has quota limits; implement exponential backoff
2. Batch Requests: Use batch endpoints for multiple operations
3. Message Format: Messages must be RFC 2822 compliant and base64url encoded

API Reference

• REST Reference: https://developers.google.com/workspace/gmail/api/reference/rest
• Guides: https://developers.google.com/workspace/gmail/api/guides
• OAuth Playground: https://developers.google.com/oauthplayground/
• Scopes: https://developers.google.com/identity/protocols/oauth2/scopes#gmail