Add Mailboxes To Existing Domains, Bulk-Edit Profiles, Safer Checkout

Buying and managing mailboxes and domains via SmartSenders just got smoother. We've shipped a few new capabilities and cleaned up the issues you flagged.
Here’s what’s New:
Add mailboxes to an existing domain - You can now purchase additional mailboxes on a domain you already own
Bulk sender-profile management - Update from-name, signature, forwarding domain, and profile picture across multiple mailboxes in one action.
3DS Card Verification - all SmartSender purchases now go through 3D Secure, with retry on failure so you're never charged without an order
SmartSenders billing tab - order history, active subscriptions, domain and mailbox billing, and upcoming charges in one place
Restore deleted mailboxes - Deleted SmartSender mailboxes now stay in a pending state until a day before your billing cycle ends, so you can restore them.
Key Fixes and Improvements:
Payment bug fixes - 3DS cancellations returning success, card purchases failing on invoice total mismatch, and incorrect amounts on the billing summary page.
Google OAuth re-auth - Fixed silent token refresh failures on delivered mailboxes.
Email forwarding - Fixed bounces on forwarding for delivered mailboxes.
Apex domain redirect - Purchased domains now redirect to a live page, preventing reputation damage from dead landing pages.
Domain payment status - Fixed NULL status showing for some domains within the same order.
Delete / swap / recover mailbox or domain - View full domain history, swap a wrong domain before provisioning completes, and delete mailboxes without errors.
We're continuing to make SmartSenders faster and easier to work with. More coming soon.