Connect all your Gmail inboxes, upload contacts, build campaigns, and let KingSmart Sender rotate sending automatically while respecting daily limits.
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Trusted by growth teams, agencies, and creators
A complete sending suite designed for teams who care about deliverability.
Securely connect unlimited Gmail accounts via Google OAuth.
Automatically rotate sending between accounts, respecting daily limits.
Rich editor with merge tags, templates, scheduling, and live preview.
Bulk CSV import, tagging, segmentation, and duplicate detection.
Real-time progress, delivery rates, and per-account performance.
Row-level isolation, encrypted tokens, and full data ownership.
From signup to first send in under five minutes.
Authorize one or more Gmail accounts in seconds with Google OAuth.
Drag and drop a CSV. We auto-validate and dedupe your list.
Compose, choose a template, set per-account limits, and launch.
Watch live progress as we rotate sending across all your accounts.
Start free. Upgrade as your sending grows.
Yes. We use Google OAuth. We never see or store your password, and tokens are encrypted at rest.
You set a daily send limit per account. Our engine cycles between active accounts, skipping any that hit their cap.
Yes. Upload a CSV with email, first_name, last_name, company, website, or any custom field. We auto-validate and dedupe.
Yes. Use {{first_name}}, {{company}}, {{website}}, or any custom field directly in your subject or body.
Rotation, randomized delays, and per-account limits keep your accounts healthy. We also recommend SPF/DKIM/DMARC.