The four mailbox providers
Every address is sorted by who handles its mail into Google, Microsoft, Yahoo or other, and each of those buckets is paced, and grows, on its own record.
How it works
Every email lands with a mailbox provider, and each one decides for itself which senders to trust. So every address is sorted by the provider that receives its mail, and each provider is paced on its own.
Four buckets, one for each provider
| Bucket | Who's in it |
|---|---|
| Gmail and Google Workspace | |
| Microsoft | Outlook, Hotmail and Office 365 |
| Yahoo | Yahoo and AOL |
| Other | Everyone else, security gateways included |
The mail server decides
The bucket comes from who handles the mail, not from how the address looks. Take an address at a company. Its domain's mail servers are looked up, once for the whole domain. If that company's mail runs on Google, the address goes in the Google bucket.
Each bucket has its own quota
- Every sending domain has a quota with each provider.
- Mail drips into each bucket at its own pace, spread across the sending window.
- Each bucket grows only on its own day's evidence.
Traffic governance explains how a quota sets the pace, and when it grows.
Why four buckets
- Each provider judges for itself whether to trust a sender.
- So each bucket is paced on its own, and grows on its own record.
- Every provider sees your mail arrive at a natural pace: Natural pace, and why it isn't warm-up.
Related
Traffic governanceEach sending domain sends to each provider at its quota divided by the sending window, and a day that fills the bucket grows the quota, while one that doesn't is never a fault.Film · 1:14Natural pace, and why it isn't warm-upMail goes out in a steady drip across the whole sending window, time not used is never made up, and a quota grows only when a domain has earned it.Film · 1:01Many sending domains, one campaignEvery campaign is shared across at least four sending domains, each at its own daily quota with each provider, so you reach more people a day while no domain sends faster.Film · 1:09Your deliverability scoreYour deliverability score rates out of 100 how much of your mail is getting through, from four things you can see: delivered, bounces, unsubscribes and your sending domains.Film · 1:32