How to Find What Share of an Email List Is Gmail, Outlook or Yahoo
To find what share of an email list is Gmail, take the domain after the @ in each address, count the unique addresses on gmail.com and googlemail.com, and divide by the number of unique addresses. The email list provider share report does this for every provider at once, in your browser.
The share shows where the list lands. It doesn't show which mailboxes exist.
Why the provider share matters
Each mailbox provider filters on its own signals and publishes its own rules. Google's email sender guidelines ask bulk senders to authenticate with SPF, DKIM and DMARC, and Yahoo publishes its own sender best practices. A list that is mostly one provider depends on how that provider sees you.
A consumer-heavy list, mostly Gmail, Outlook and Yahoo, also behaves differently from a company list, because free addresses are easy to create, abandon and mistype.
The by-hand way
- Put the addresses in a sheet and pull the domain after the @ into its own column.
- Remove repeats, ignoring capitals.
- Count the rows for each free provider domain:
gmail.com,outlook.com,hotmail.com,yahoo.com,icloud.comand the rest. - Everything left is a company domain. Divide each count by the total.
Step 1: paste the list
Paste addresses one per line, or upload a CSV. Addresses are found anywhere in the text. Nothing is uploaded.
Step 2: add a daily volume (optional)
Type how many emails you plan to send a day to see that volume split in proportion to the list.
Step 3: read the share
| Group | What it holds |
|---|---|
| Gmail | gmail.com and googlemail.com |
| Outlook, Hotmail, Live and MSN | Microsoft's consumer mail |
| Yahoo | yahoo.com and its country domains |
| iCloud, AOL, Proton | the matching free providers |
| Company domains | every other domain |
What this report cannot do
- It can't say which provider hosts a company domain. For that, use the bulk email provider lookup, which reads each domain's MX records.
- It doesn't tell you which mailboxes exist.
To split the list into one file per group, use the email list segmenter.
Next: check the addresses
For the addresses themselves, use the verify page: the first 100 checks are free with a Google sign-in, no card.
Try it now
Paste your list into the email list provider share report at simpleverifier.com.
Common questions
How do I see what percentage of my email list is Gmail?
Take the domain after the @ in each address, count the ones on gmail.com and googlemail.com, and divide by the number of unique addresses. An email list provider share report does that for every provider at once.
Does the share tell me which provider hosts a company's email?
No. A company domain could be hosted by Google Workspace, Microsoft 365 or another provider. Only its MX records say which.
Does the share show which addresses will bounce?
No. It shows where the list lands, not whether each mailbox exists.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.