How many emails can I send per day from a new domain?
The short answer
Far fewer than the mailbox allows. Google Workspace caps a paid user at 2,000 messages a day and Microsoft 365 at 10,000 recipients, but a new domain has no reputation, so start in the tens per mailbox and raise volume only while the Postmaster Tools spam rate stays under 0.10%. At 5,000 a day, bulk-sender rules apply.
The hard caps are not the real limit
There are two numbers in this question and founders usually ask about the wrong one. The first is the ceiling your mailbox provider enforces. The second is the volume a domain with no history can send before Gmail, Yahoo and Outlook start filtering it. The first is published and generous. The second is not published anywhere and is much lower.
| Limit | Google Workspace (Gmail) | Microsoft 365 (Exchange Online) |
|---|---|---|
| Messages or recipients per day, per user | 2,000 messages | 10,000 recipients |
| Trial account | 500 messages | Tenant capped at 5,000 external recipients |
| Unique external recipients per day | 2,000 | Set per tenant by license count |
| Rate | Not stated as a per-minute figure | 30 messages per minute |
| Provider's own position on bulk mail | Limits apply per user | "Exchange Online isn't suited to accommodate bulk-mailing scenarios" |
Sources: Google Workspace sending limits and Exchange Online limits.
Those caps exist to stop abuse of the provider's own infrastructure. They say nothing about whether the mail will land. A brand-new Workspace mailbox can physically send 2,000 messages tomorrow. If it does, most of them will be filtered, the domain's reputation will start its life in the Low or Bad band, and the sender will not be told — the campaign will simply produce nothing.
What a new domain can actually send
The number that governs a new domain is reputation, and a new domain has none. Google's guidance for building it is to start with a low volume to engaged users, increase slowly, and avoid sudden spikes when you have no history at that level (sender guidelines). It does not give a figure. The most concrete published schedule is one vendor's: Twilio SendGrid's automated warm-up starts a new dedicated IP at 20 messages an hour on day 0, reaches 211 an hour by day 7 and 2,222 an hour by day 14, over a 41-day ramp (SendGrid warm-up schedule). That schedule is written for transactional and marketing mail on dedicated infrastructure and its later days run to numbers no cold outbound program should touch; what transfers is the shape, an increase of roughly 40% a day from a deliberately small start.
For cold outbound from an ordinary mailbox, the working answer is this. In the first week, send in the tens per mailbox, to the people most likely to respond. Raise the daily volume in steps and hold each step for a few days. Check Google Postmaster Tools before every increase: if the spam rate is under 0.10% and the reputation reading is not falling, take the next step; if the rate approaches 0.30%, stop, because at that level Google withdraws delivery support until you have been under 0.30% for seven consecutive days (Google FAQ). Low hundreds per mailbox per day is a realistic destination after a month of clean sending. Anything higher is a question of how many mailboxes and subdomains you run, not how hard you push one.
Three things reset the count. Skipping steps. Sending to a list that was never verified, because bounces during the ramp tell the provider you do not know your own list. And going quiet for weeks and then coming back at the old volume, which the provider reads as a new sender, because in every way it can measure, it is.
The 5,000-a-day line
There is one published threshold, and it is not a limit but a
classification. Google treats a domain that sends more than 5,000 messages a
day to Gmail accounts as a bulk sender and holds it to the full set of
requirements: SPF, DKIM and DMARC, a From: domain aligned with one of them,
one-click unsubscribe on marketing mail, and the spam-rate ceiling
(sender guidelines). Messages
from subdomains count toward the primary domain's total, and the
classification is permanent: a domain that crosses the line once stays a bulk
sender (Google FAQ).
Microsoft draws the same line at 5,000 messages to its consumer services
from one From: domain, requires SPF, DKIM and DMARC all passing from that
point on, and rejects non-compliant mail with 550 5.7.515
(Microsoft Support).
Yahoo applies its bulk-sender rules, including a spam rate under 0.3% and
unsubscribes honored within two days, the same way
(Yahoo Sender Hub).
For a founder-led company this is mostly academic. A team that reaches 5,000 outbound messages a day is running dozens of mailboxes, and its problem is not the threshold but the list quality needed to keep the spam rate under 0.1% at that scale. The useful takeaway is the other direction: authenticate the domain fully on day one as if you were already a bulk sender, because the day you cross the line there is no grace period and no way back across it.
Where SalesARC fits
SalesARC Prospect ramps each new sending channel gradually, the way the inbox providers describe, instead of letting a new mailbox send at its provider cap on day one. Every address is verified before send so the ramp is not wasted on bounces, the suppression list is enforced at send time, and each channel sends from a dedicated subdomain of your domain rather than a shared pool. Basic ($199/mo) includes one warmed channel and 2,500 contacts; Standard ($499/mo) allows up to three channels; Enterprise ($1,499/mo) allows unlimited channels and puts a person on your sending reputation. That controls how fast a domain is pushed. It does not change the fact that the volume a domain can sustain is set by how recipients treat the message, and that is the playbook's job.
See SalesARC Prospect or build a plan.