Protect Your Sender Reputation
Tantra paces every send from your own Google Workspace mailboxes, skips contacts who have opted out, and adds one-click unsubscribe to every message.
Trusted by operators behind 250+ brands
Five Safeguards on Every Send
Every email passes the same five controls, whichever campaign sends it.
- 1Do-not-contact checkSuppressed and unsubscribed contacts are skipped
- 2Mailbox capsDaily and hourly limits for each mailbox
- 3Sending windowSends in the recipient’s timezone
- 4Bounce suppressionA hard bounce ends the sequence and suppresses the address
- 5One-click unsubscribeList-Unsubscribe header and a footer link
Sending Discipline, Built In
Checks at Enrollment and at Every Send
Suppressed and unsubscribed contacts are never enrolled, and a contact who opts out mid-campaign is removed from the remaining steps. Invalid addresses are quarantined for review. Outside the sending window or over a cap, the email waits.
Warmup Between Your Own Mailboxes
Two or more of your connected mailboxes exchange warmup mail. Each starts at 5 a day and adds 5 every 3 days toward the target you set, 100 a day by default.
Per-Mailbox Caps and Your Own Tracking Domain
Each mailbox sends up to 50 emails a day and 25 an hour by default, adjustable up to 1,500 a day. With one CNAME record, click and unsubscribe links resolve on your own domain.
Sending Performance by Mailbox
Sent, replied, and bounced for each mailbox, so your team can rest a sender whose bounces rise.
Suppression and Unsubscribe Controls
One-click unsubscribe headers on every message, and a suppression list checked at enrollment and before every send. Block individual addresses, whole domains, top-level domains, or role mailboxes, and bulk-import existing lists by CSV.
Sending Results in One Report
Sample data from the analytics report: 9,540 sent, 167 bounced, so 9,373 delivered. An 8.7% reply rate and a 1.8% bounce rate, paced across twelve of your own mailboxes with no shared sending pool.