How Many Cold Emails Can You Send Per Day per Inbox? Provider Limits and a Warm-Up Schedule

What are the hard sending limits?

These are provider limits, and they are ceilings, not targets. For Google Workspace, Google's sending-limits page lists, for paid accounts, 2,000 messages per user per day, 1,500 messages per day for mail merge, and 500 per day for trial accounts. It lists 3,000 external recipients per day, and 2,000 external unique recipients. Hit a limit and the user cannot send new mail for up to 24 hours. The page also says sending limits can change without notice.

For Microsoft 365, the Exchange Online limits page (updated 19 October 2026) sets a recipient rate limit of 10,000 recipients per day per mailbox and a message rate limit of 30 messages per minute. It also describes a tenant-wide external recipient limit that depends on the number of licences, and a limit of 100 external recipients per day for the default onmicrosoft.com domains. Microsoft points senders who need more toward Azure Communication Services email.

Nothing on either page says what volume is safe for cold email. A limit of 2,000 tells you when the provider will stop you. It says nothing about when Gmail, Yahoo or Outlook will start treating your messages as junk.

What do mailbox providers measure instead?

Complaints, mostly. Google's sender guidelines say to keep the spam rate reported in Postmaster Tools below 0.10% and to avoid ever reaching 0.30%. Google's FAQ adds that senders above 0.3% are ineligible for mitigation and become eligible again after seven consecutive days below it. Those are thresholds.

Do the arithmetic for a small sender, because it shows why volume discipline matters. 0.1% is one complaint per 1,000 delivered messages. 0.3% is three per 1,000. At 30 emails a day from each of five inboxes, you send about 150 a day, or roughly 4,500 a month. As an illustration only, since Postmaster Tools measures per day on Gmail traffic: three "report spam" clicks against 4,500 messages is about 0.07%, and ten is about 0.22%. A small sender has little room, which is a good reason to ramp slowly.

What do cold email tool vendors recommend, and why do they disagree?

Read that table as a spread of opinion, not a consensus. Instantly's help article and warm-up guide sit at 30 to 50 a day and 30 including warm-up. Smartlead's guide puts the cold cap at 50 to 200. The ranges overlap only at the edge. These vendors also sell warm-up and sending tools, which is a reason to treat the higher figures with care. We have no sending data of our own to settle it.

What is a cautious warm-up schedule?

This is our planning default, built from the low end of the vendor ranges and the Google thresholds above. It is not tested on live MAJ sending, because that does not exist yet, and it is not a promise of inbox placement. Treat it as a starting point you adjust against your own bounce and complaint numbers.

1. Authenticate first. Set up SPF, DKIM and DMARC before the first message. Google's guidelines require SPF or DKIM from all senders, whatever the volume. Details are in our post on bulk sender rules.
2. Keep the volume per domain modest. Instantly suggests 3 to 5 inboxes per domain. At 5 inboxes and the 30 a day cap above, that is about 150 messages a day per domain, well below the 5,000 a day line at which Google's bulk rules apply.
3. Scale by adding inboxes, not by raising the cap. This is practice from the vendors above, and it keeps each inbox's pattern steady.
4. Stop and diagnose on a spike. A rising bounce rate or a complaint is a reason to pause the ramp, check the list, and look at what you sent, before sending more.
5. Send the legal minimum on every email. A working opt-out, a true sender identity and a postal address. See CAN-SPAM for cold email and UK cold email rules.

What will MAJ Leads do about send limits?

We are building cold email into MAJ Leads now. Our intention is to enforce a per-inbox daily cap and a ramp like the one above in the product, rather than leaving it to each user, and to publish measured bounce and complaint rates once there is real sending to measure. Until then, nothing on this page is a result from MAJ Leads sending. See how it works for what exists today and pricing for plans.