One outbound workspace. Multiple ways to reach and measure.
Two campaign paths. Sequences run any valid mix of Gmail, LinkedIn, WhatsApp, and Telegram steps, including social-only. Calendar campaigns send Google Calendar invitations and measure RSVP. Send from the accounts each channel requires, personalize eligible email or Calendar content when useful, and measure the signals each campaign can actually return.
LinkedIn, WhatsApp, and Telegram are available as separate channel add-ons at $10 per month each. Google Workspace is required only for Calendar campaigns or sequences containing Gmail steps.
Gmail is included with a connected Google Workspace. LinkedIn, WhatsApp, and Telegram are separate channel add-ons at $10 per month each, so running two of them costs twice that.
01 · Omnichannel sequences
Sequences that stop when they should
One sequence, ordered steps, per-step delays, and stored templates. A step can be Gmail, LinkedIn, WhatsApp, or Telegram in any valid mix, and a sequence may be social-only with no Gmail step at all. Optional AI personalizes eligible email content when a usable business website is available, with the stored version as the fallback; social messages use templates, variables, and spintax. Sequence-linked replies update enrollment, and Tantra does not add an open pixel.
Four channels, one sequence
Each channel a sequence uses needs its own ready connected sender account. A missing recipient identity skips that channel's step rather than failing the sequence, and a LinkedIn message step can wait for the connection request to be accepted.
Gmail
- Send an email step from a verified Workspace mailbox
- Keep follow-ups on the same thread
- Optional AI personalization on subject and body
- Visit a profile
- Send a connection request with an optional note
- Send a message
- Send a plain-text message to a contact phone number
Telegram
- Send a plain-text message to a connected Telegram identity
LinkedIn, WhatsApp, and Telegram are paid channel add-ons at $10 per month each, billed on top of your plan. Google Workspace is required only for a Calendar campaign or a sequence containing Gmail steps.
Template fallback
Keep approved stored copy available when optional website research or AI personalization cannot complete.
Validation before enrollment
Syntax, MX, and role address checks run before a contact enters a sequence. Anything questionable is quarantined instead of sent.
Suppression that sticks
One click unsubscribe headers on every message, plus a suppression list checked before every single send.
02 · Replies
Replies with campaign context
Threaded Gmail replies and supported mirrored social conversations return to Tantra's inbox surfaces. Sequence-linked replies update enrollment; email bounces and unsubscribes feed the safeguards that prevent inappropriate follow-up.
This is timely, we are reviewing vendors this quarter. Can you send pricing?
Interesting, but this is out of budget for us right now.
Not me, but you should talk to our ops lead. Copying her here.
Revisit this in Q3 please, we are mid migration until then.
I am out of the office until the 14th with limited email access.
No open tracking. On purpose.
Tantra does not add an invisible open pixel. When signed-link tracking is enabled, new sends resolve the current verified default tracking domain at send time. Replies, supported clicks, bounces, and unsubscribes remain the actionable email signals.
03 · Calendar outreach
Invitations, not another email
Tantra creates a Google Calendar event and adds recipients as attendees, so Google delivers the invitation and it lands on their agenda. RSVP Yes, No, and Maybe are the engagement signals. Link Zoom or WebinarGeek for attribution, then request provider syncs when you need refreshed registrant or attendance data.
| Campaign | Tag | Status | Invited | Yes | Maybe | No | Pending | Event date |
|---|---|---|---|---|---|---|---|---|
| Product webinar, March cohort | webinar | Active | 18,420 | 4,318 | 1,102 | 1,204 | 11,796 | Mar 14, 2026 |
| Enterprise demo series, set A | demo | Active | 9,640 | 2,284 | 610 | 742 | 6,004 | Mar 18, 2026 |
| Partner enablement workshop | partner | Draft | 0 | 0 | 0 | 0 | 0 | Apr 2, 2026 |
Distributed across senders
Large contact lists are distributed across verified Calendar senders in scheduled batches, and recoverable work is retried automatically.
Selectable RSVP webhooks
Subscribe an HTTPS endpoint to Calendar RSVP Yes, No, and Maybe events. Delivery is at least once, so consumers deduplicate by event ID.
Zoom and WebinarGeek sync
Link a webinar for attribution. An opted-in Calendar campaign can register Yes or Maybe RSVPs; provider catalog and attendance refreshes remain user-triggered.
04 · AI layer
Your key, your model, your prompt
Connect and test OpenRouter, Cerebras, or Novita, choose a supported model, and set one default provider. Campaign AI is optional and applies to eligible email subject/body and Calendar descriptions; social messages use templates, variables, and spintax.
Write like a founder emailing a peer. Two sentences of context from their site, one specific question. No superlatives.
Hi Dana, I saw Northwind opened the Rotterdam depot in January and is hiring dispatch coordinators for it. Usually that means route planning is about to get painful. How are you handling driver comms across the two sites right now?
Run Tantra from Claude or Cursor
Tantra's MCP server exposes dozens of supported tools through local stdio or hosted Streamable HTTP to compatible clients. It is a defined operational surface rather than a mirror of every product action.
05 · Deliverability
Operational controls before every email
Sender readiness, account-level caps, schedules, validation, suppression, and restrained formatting reduce preventable risk. Tantra cannot guarantee provider delivery or inbox placement.
Sender performance
Per mailbox, with warmup state
| Mailbox | Sent | Replies | Reply rate | Bounce | Warmup |
|---|---|---|---|---|---|
| sender-01@yourdomain.example.com | 1,450 | 94 | 6.5% | 0.7% | Warmed |
| sender-02@yourdomain.example.com | 1,380 | 82 | 5.9% | 0.9% | Warmed |
| sender-03@outreach.example.com | 1,290 | 71 | 5.5% | 1.1% | Warmed |
| sender-04@outreach.example.com | 620 | 38 | 6.1% | 0.6% | Warming |
06 · Compliance
Unsubscribe and suppression
One click unsubscribe headers on every message, and a suppression list checked before every send. Block individual addresses, whole domains, top level domains, or role mailboxes, and bulk import existing lists by CSV.
| Value | Reason | Added |
|---|---|---|
| optout@example.com | One click unsubscribe | Mar 4, 2026 |
| info@example.org | Role mailbox | Mar 3, 2026 |
| example.net | Domain block | Mar 1, 2026 |
| bounced@example.com | Hard bounce | Feb 27, 2026 |
07 · Integrations
Supported outcomes, ready for the next workflow
Subscribe an HTTPS endpoint to the campaign events your workflow needs, use supported routes through an account-level API key, or operate Tantra's exposed tool set through MCP. n8n, Zapier, and Make are generic webhook destinations rather than native apps.
Eleven selectable event types
Subscribe to Calendar RSVP, email bounce/click/reply/unsubscribe, LinkedIn acceptance/reply, WhatsApp reply, and Telegram reply events. Delivery is at least once; consumers deduplicate by event ID.
REST API with account-level keys
Create revocable keys with optional expiry for supported API-key routes. The full key is displayed once, and a key is account-level rather than permission-scoped.
n8n, Zapier, and Make
Point a webhook at your automation tool and take any action from there: create the CRM record, queue a LinkedIn touch, alert Slack, enrich the contact, append a row, or call your own service.
Google Workspace, Zoom, and WebinarGeek
Verify Workspace senders for Gmail or Calendar. Zoom and WebinarGeek refresh when requested; opted-in Calendar positive RSVPs can register, while sequences provide attribution only.
{
"event": "email.replied",
"eventId": "evt_...",
"campaignId": "campaign_...",
"contactId": "contact_..."
}Two campaign paths. Every account you own.
Start on the free plan and connect your first account today. LinkedIn, WhatsApp, and Telegram are separate channel add-ons at $10 per month each.