How to send all mails in a label

To send all emails in a label, you can use the Gmail API or the Gmail web interface. Here are the steps for both methods:

Method 1: Using the Gmail API

  1. Enable the Gmail API for your project in the Google Cloud Console.
  2. Install the Google API Client Library for your programming language of choice.
  3. Use the users.messages.list method to retrieve a list of messages in the label.
  4. Use the users.messages.batchModify method to send all the messages in the label.

Here's an example in Python using the Google API Client Library:

import os
import google.auth
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError

# Set up authentication
creds, project = google.auth.default(scopes=['https://www.googleapis.com/auth/gmail.modify'])

# Create the Gmail API client
service = build('gmail', 'v1', credentials=creds)

# Set the label ID
label_id = 'INBOX/label-name'

# Retrieve the list of messages in the label
response = service.users().messages().list(userId='me', labelIds=[label_id]).execute()
messages = response.get('messages', [])

# Send all the messages in the label
for message in messages:
    message_id = message['id']
    try:
        service.users().messages().modify(userId='me', id=message_id, body={'removeLabelIds': [label_id]}).execute()
    except HttpError as error:
        print(f'Error sending message {message_id}: {error}')

Method 2: Using the Gmail web interface

  1. Log in to your Gmail account.
  2. Click on the gear icon in the top right corner and select "See all settings".
  3. Click on the "Filters and Blocked Addresses" tab.
  4. Click on the "Create a new filter" button.
  5. In the "From" field, enter the label name (e.g. "INBOX/label-name").
  6. Click on the "Create" button.
  7. In the "Apply the label" dropdown menu, select "Apply the label" and then select the label you want to apply to the messages.
  8. Click on the "Create" button.

This will apply the label to all messages in the label, and you can then use the "Bulk actions" feature to send all the messages in the label.

Note: You can also use the "Bulk actions" feature to send all the messages in a label by selecting the label and then clicking on the "Bulk actions" dropdown menu and selecting "Send all messages".