curl -X POST "https://server.smartlead.ai/api/v1/campaigns/123/email-accounts/by-tag?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"tag_ids": [485775], "only_connected": true}'

import requests

API_KEY = "YOUR_API_KEY"
campaign_id = 123

# Look the tag id up once via GET /api/v1/email-accounts/tags
payload = {
    "tag_ids": [485775],
    "only_connected": True
}

response = requests.post(
    f"https://server.smartlead.ai/api/v1/campaigns/{campaign_id}/email-accounts/by-tag",
    params={"api_key": API_KEY},
    json=payload
)
response.raise_for_status()
result = response.json()

resolution = result["tag_resolution"]
print(f"attached {result['added_count']} mailbox(es)")
print(f"already on the campaign: {result['already_associated_count']}")
print(f"tag matched {resolution['resolved_account_count']}, "
      f"skipped {resolution['skipped_disconnected_count']} disconnected")

const API_KEY = 'YOUR_API_KEY';
const campaignId = 123;

const response = await fetch(
  `https://server.smartlead.ai/api/v1/campaigns/${campaignId}/email-accounts/by-tag?api_key=${API_KEY}`,
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      tag_ids: [485775],
      only_connected: true
    })
  }
);

const result = await response.json();
console.log(`attached ${result.added_count}, already associated ${result.already_associated_count}`);
console.log(result.tag_resolution);

{
  "ok": true,
  "result": [
    { "id": 99101, "email_campaign_id": 123, "email_account_id": 456 },
    { "id": 99102, "email_campaign_id": 123, "email_account_id": 457 }
  ],
  "added_count": 2,
  "already_associated_count": 0,
  "tag_resolution": {
    "matched_tags": [{ "id": 485775, "name": "smartservices" }],
    "resolved_account_count": 3,
    "disconnected_account_count": 1,
    "skipped_disconnected_count": 1
  }
}

{
  "ok": true,
  "result": [],
  "added_count": 0,
  "already_associated_count": 0,
  "tag_resolution": {
    "matched_tags": [{ "id": 485775, "name": "smartservices" }],
    "resolved_account_count": 0,
    "disconnected_account_count": 0,
    "skipped_disconnected_count": 0
  },
  "message": "No mailboxes carry the requested tag(s)."
}

{
  "error": "Tag id - 999 not allowed. Permission Error."
}

{
  "error": "Campaign not found - Invalid campaign_id."
}