Email domain report
UCSF email format (ucsf.edu): verification & catch-all status
As of November 6, 2026, the most common ucsf.edu email format is [email protected], used by 93–96% of the at least 550 distinct ucsf.edu addresses mailfloss verified in the 90 days to November 6, 2026. ucsf.edu routes incoming mail through Proofpoint. In mailfloss's checks (latest November 6, 2026), ucsf.edu mostly rejected addresses that do not exist, so it is not a catch-all domain. 63% of mailfloss's ucsf.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@- 93–96% of distinct addresses
- Catch-all
- No
- mostly rejects unknown mailboxes · checked November 6, 2026
- Accepted on verification
- 63%
- of verifications, 90 days to November 6, 2026
Verification results
How ucsf.edu responds to email verification
How ucsf.edu answered when mailfloss verified its addresses in the 90 days to November 6, 2026, most recently on November 6, 2026.
Where ucsf.edu stands among Proofpoint domains
Accepted on verificationshare of verifications accepted
63% ucsf.edu61–64% median of 28 Proofpoint domains
Leading listed formatshare of distinct addresses in the most common listed format
93–96% ucsf.edu83–95% median of 28 Proofpoint domains
Rejected on verificationshare of verifications rejected
8% ucsf.edu14–17% median of 27 Proofpoint domains
Most common ucsf.edu email formats
| Format | What it means | Share | 95% range | Addresses |
|---|---|---|---|---|
[email protected] | First name, dot, last name | 93–96% | 91–97% | 520+ |
| — | Contains digits | 2% | 0–5% | 10+ |
| — | Other pattern | 1% | 0–4% | 5+ |
| — | Other formats, combined | 1% | — | 5+ |
Shares are of the 550+ distinct ucsf.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 ucsf.edu
| Response | What it means | Share of listed responses |
|---|---|---|
250 | Mailbox accepted the addressDeliverable | 89% |
550 5.1.1 | Mailbox does not existUndeliverable | 11% |
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 mxb-002e8f01.gslb.pphosted.com
SPF published · DMARC published
Mailbox provider Microsoft 365
Free check
Verify an address at ucsf.edu
Type the part before the @. mailfloss asks the ucsf.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 ucsf.edu
UCSF 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 UCSF use?
ucsf.edu. Its mail is routed through Proofpoint (mxb-002e8f01.gslb.pphosted.com), with SPF published and DMARC published, checked November 6, 2026.
What is the most common ucsf.edu email format?
[email protected]: 93–96% (95% range 91–97%) of the 550+ distinct ucsf.edu addresses mailfloss verified in the 90 days to November 6, 2026. Next: "contains digits" at 2% and "other pattern" at 1%.
Is ucsf.edu a catch-all domain?
No. In mailfloss's checks (latest November 6, 2026), ucsf.edu mostly rejected addresses that do not exist, so it is not a catch-all domain. Because ucsf.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 ucsf.edu addresses bounce?
Of mailfloss's ucsf.edu verifications in the 90 days to November 6, 2026, 63% were accepted, 29% got no clear answer and 8% were rejected.
How do I find or check an email address at ucsf.edu?
Build it from the person's name in the most common format, [email protected], then verify it before you send: mailfloss asks the ucsf.edu mail server about that exact address and reports what it answered. Because ucsf.edu is not a catch-all domain, a clear answer means what it says. Verify one now.
Does UCSF use Google Workspace or Microsoft 365?
Microsoft 365, the mailbox provider on mailfloss's record. Its published MX record points to Proofpoint, a security gateway that filters mail before it reaches the mailbox, going by its public mail records as of November 6, 2026.
Typo Fixer · company domains
A subscriber who typed ucfs.edu is still a customer of UCSF.
Most verifiers mark ucfs.edu invalid and delete the subscriber. mailfloss's Typo Fixer suggests ucsf.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@ucfs.edu; Typo Fixer suggests first.last@ucsf.edu and queues it for your approval.
Other company domains on Proofpoint
All 28 Proofpoint domains| Domain | Most common format | Accepted on verification | Catch-all |
|---|---|---|---|
| uhhospitals.orgUniversity Hospitals | [email protected]78–100% of addresses | 80% | catch-all: No |
| utsouthwestern.eduUT Southwestern Medical Center | [email protected]94–97% of addresses | 85% | catch-all: No |
| verizon.comVerizon | [email protected]68–85% of addresses | 47–54% | catch-all: No |
| wellsfargo.comWells Fargo | [email protected]71–80% of addresses | 46% | catch-all: No |
| abbott.comAbbott | [email protected]92–95% of addresses | 65% | catch-all: No |
| accenture.comAccenture | [email protected]54–63% of addresses | 53–59% | catch-all: No |
One check is a start. Keep every address on your list deliverable.
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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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