Warmup on a measured ramp
Gmail sending limits
Google publishes a ceiling. Your mailbox has a cap, and the two are not the same number.
Gmail enforces a daily ceiling per mailbox, and it is far higher than any cold mailbox should approach. The number that decides whether your mail reaches an inbox is lower and moves every day: the volume the mailbox's reputation can carry without tipping into spam.
A new mailbox can carry almost nothing. Warmup raises it on a ramp, roughly 10, 20, 35, 50 and then 60 a day, over 6 to 8 weeks. A healthy warmed mailbox settles around 60 messages a day. Going past that does not fail loudly. It fails quietly, with placement sliding into promotions and spam while the send count looks fine.
Capacity is therefore added with mailboxes, not with volume per mailbox. A set of 5 to 10 function mailboxes on an isolated subdomain sends 300 to 600 a day in total, each one under its own cap.
The cap is set by the reading, never by hand. When the reading dips, the cap comes down before the damage is done.
Questions
Does Google Workspace change the limit?
It changes the ceiling, not the cap. A paid mailbox with no reputation is still a new mailbox. Warmup and the daily reading apply the same way.
What about Outlook?
The same logic, different thresholds and different filters. Outlook placement is read on its own seed inboxes, and a mailbox can be healthy on one provider and slipping on the other.
Terms and pages this builds on
This page is part of outbound engineering, the practice of running B2B outbound as a measured system.
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