Email sending limits by provider (Gmail, Outlook, SMTP, SES)
Gmail Workspace caps ~2,000 recipients/day (far lower for cold), Outlook ~10,000 but throttles new senders hard, SES scales with reputation. For cold email, the safe cap is ~30–50/mailbox/day. Here's the table.
Short answer: provider *account* limits — Gmail Workspace ~2,000 recipients/day, Outlook ~10,000/day, Amazon SES scaling with reputation — sit way above what's safe for cold email. For cold outreach the real cap is ~30–50 emails per mailbox per day after warmup, and deliverability sets that number, not the provider's hard limit. Scale by adding mailboxes, not by running one hotter.
Provider hard limits (for context, not targets)
- Gmail / Workspace: ~2,000 external recipients/day (much lower while new).
- Outlook / Microsoft 365: ~10,000/day, but throttles new senders aggressively.
- SMTP relays / SES: scale with your sending reputation + approved quota.
The cap that actually matters for cold
30–50/mailbox/day after warmup. Need 400/day? Run ~10 mailboxes and rotate across them. Push one mailbox to its provider max and you get flagged fast.
Autocloz enforces per-mailbox daily caps plus min-gap pacing and rotates across your pool for you.
> Start free — scale safely across a mailbox pool, not a single inbox.