Sender Warmup and Daily Limits

Every campaign send is checked against the lowest active limit. A user can choose guided warmup or manual limits for prewarmed senders.

Limit modes

Warmup is the default for new sender domains.

Warmup defaults per inbox

Effective sending capacity

Campaign sending uses the lowest active limit:

• Inbox daily limit.
• Domain daily limit.
• Campaign daily limit.
• Warmup or manual mode cap.
• Send window.
• Weekday-only rule.
• A hard 5 minute gap between campaign emails for the account owner.
• Per-inbox pacing with a daily first-send offset and deterministic spacing jitter.
• Suppression status.
• Report quality gate.

If any gate blocks a row, cron defers it instead of bypassing limits.

Pacing

Campaign emails are sent one at a time. DeepSyte waits at least 5 minutes between campaign emails for the same account owner, then also checks the selected inbox's own pacing. Each inbox gets a stable daily first-send offset and spacing jitter based on its send window and effective daily cap, so warmup inboxes do not all send at the same minute.

For example, a new warmup inbox at 5/day inside a 9am-4pm window is paced across the day instead of sending five messages back-to-back. If cron finds a row too early, it leaves the row pending and tries again later.

Auto-pause

DeepSyte pauses senders when AgentMail returns auth failure, provider rate limit, repeated send errors, or suspicious provider responses. The Inbox page shows the pause reason.