Email domain report
Rush University Medical Center email format (rush.edu): verification & catch-all status
As of November 6, 2026, the most common rush.edu email format is [email protected], used by 71–87% of the at least 45 distinct rush.edu addresses mailfloss verified in the 90 days to November 6, 2026. rush.edu routes incoming mail through Microsoft 365. In mailfloss's checks (latest November 6, 2026), rush.edu mostly rejected addresses that do not exist, so it is not a catch-all domain. 75% of mailfloss's rush.edu verifications in the 90 days to November 6, 2026 were accepted.
One address at a time, right on this page · counts rounded
- Most common format
first_last@- 71–87% of distinct addresses
- Catch-all
- No
- mostly rejects unknown mailboxes · checked November 6, 2026
- Accepted on verification
- 75%
- of verifications, 90 days to November 6, 2026
Verification results
How rush.edu responds to email verification
How rush.edu answered when mailfloss verified its addresses in the 90 days to November 6, 2026, most recently on November 6, 2026.
Where rush.edu stands among Microsoft 365 domains
Accepted on verificationshare of verifications accepted
75% rush.edu76–81% median of 49 Microsoft 365 domains
Leading listed formatshare of distinct addresses in the most common listed format
71–87% rush.edu85–95% median of 49 Microsoft 365 domains
Rejected on verificationshare of verifications rejected
23% rush.edu12% median of 39 Microsoft 365 domains
Most common rush.edu email formats
| Format | What it means | Share | 95% range | Addresses |
|---|---|---|---|---|
[email protected] | First name, underscore, last name | 71–87% | 56–94% | 35+ |
[email protected] | First name, middle initial, last name (underscore-separated) | 20–32% | 11–46% | 10+ |
Shares are of the 45+ distinct rush.edu addresses mailfloss verified in the 90 days to November 6, 2026. A range shows where a share can sit given the addresses behind it. Uncommon formats are combined, and the words in each format are placeholders, never real names.
SMTP responses from rush.edu
| Response | What it means | Share of listed responses |
|---|---|---|
250 | Mailbox accepted the addressDeliverable | 77% |
550 5.4.1 | Mailbox does not existUndeliverable | 23% |
Only answers about the mailbox itself are listed.
Catch-all
No, mostly rejects unknown mailboxes
Last checked November 6, 2026
DNS, checked November 6, 2026
MX rush-edu.mail.protection.outlook.com
SPF published · DMARC published
Free check
Verify an address at rush.edu
Type the part before the @. mailfloss asks the rush.edu mail server about that address and tells you in seconds what it answered: the same verification behind the results on this page.
Any other domain works too: type a full address. The result appears under the box; nothing you type is stored on this page.
Questions about rush.edu
Rush University Medical Center email questions, answered from this data
Every answer comes from the numbers on this page, 90 days to November 6, 2026.
What email domain does Rush University Medical Center use?
rush.edu. Its mail is routed through Microsoft 365 (rush-edu.mail.protection.outlook.com), with SPF published and DMARC published, checked November 6, 2026.
What is the most common rush.edu email format?
[email protected]: 71–87% (95% range 56–94%) of the 45+ distinct rush.edu addresses mailfloss verified in the 90 days to November 6, 2026. Next: [email protected] at 20–32%.
Is rush.edu a catch-all domain?
No. In mailfloss's checks (latest November 6, 2026), rush.edu mostly rejected addresses that do not exist, so it is not a catch-all domain. Because rush.edu mostly rejects mailboxes that do not exist, a permanent (5xx) "mailbox does not exist" or "account disabled" answer from it is reliable, and those addresses can come off your list; a 4xx answer is temporary, so retry it. An accepted answer is strong but not certain evidence that the mailbox exists. A full inbox or a busy mailbox is temporary, so recheck those later.
Do rush.edu addresses bounce?
Of mailfloss's rush.edu verifications in the 90 days to November 6, 2026, 75% were accepted, 23% were rejected and 2% got no clear answer.
How do I find or check an email address at rush.edu?
Build it from the person's name in the most common format, [email protected], then verify it before you send: mailfloss asks the rush.edu mail server about that exact address and reports what it answered. Because rush.edu is not a catch-all domain, a clear answer means what it says. Verify one now.
Does Rush University Medical Center use Google Workspace or Microsoft 365?
Microsoft 365, the mailbox provider on mailfloss's record. Its published MX record points there too, going by its public mail records as of November 6, 2026, with no security gateway in front of it.
Typo Fixer · company domains
A subscriber who typed ruhs.edu is still a customer of Rush University Medical Center.
Most verifiers mark ruhs.edu invalid and delete the subscriber. mailfloss's Typo Fixer suggests rush.edu instead, checks whether that mailbox exists, and queues the fix for you to approve. Nothing changes behind your back.
On your signup form
Example: a subscriber types first_last@ruhs.edu; Typo Fixer suggests first_last@rush.edu and queues it for your approval.
Other company domains on Microsoft 365
All 49 Microsoft 365 domains| Domain | Most common format | Accepted on verification | Catch-all |
|---|---|---|---|
| sap.comSAP | [email protected]83–90% of addresses | 73–78% | catch-all: No |
| shamrockfoods.comShamrock Foods | [email protected]78–100% of addresses | 90–97% | catch-all: Yes |
| siemens-energy.comSiemens Energy | [email protected]94–100% of addresses | 76–80% | catch-all: No |
| trinet.comTriNet | [email protected]99% of addresses | 94% | catch-all: No |
| uiowa.eduUniversity of Iowa | [email protected]88–94% of addresses | 95% | catch-all: No |
| umassmed.eduUMass Chan Medical School | [email protected]78–90% of addresses | 75% | catch-all: No |
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Every number here comes from verifications mailfloss ran for its customers in the 90 days to November 6, 2026. Pages show rounded aggregates only: no email addresses, names or single results. Read how mailfloss measures email formats and catch-all status.
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