Email domain report
Optum email format (optum.com): verification & catch-all status
As of November 6, 2026, the most common optum.com email format is [email protected], used by 50–59% of the at least 75 distinct optum.com addresses mailfloss verified in the 90 days to November 6, 2026. optum.com routes incoming mail through Proofpoint. In mailfloss's checks (latest November 3, 2026), optum.com mostly rejected addresses that do not exist, so it is not a catch-all domain. 61–66% of mailfloss's optum.com 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@- 50–59% of distinct addresses
- Catch-all
- No
- mostly rejects unknown mailboxes · checked November 3, 2026
- Accepted on verification
- 61–66%
- of verifications, 90 days to November 6, 2026
Verification results
How optum.com responds to email verification
How optum.com answered when mailfloss verified its addresses in the 90 days to November 6, 2026, most recently on November 5, 2026.
Where optum.com stands among Proofpoint domains
Accepted on verificationshare of verifications accepted
61–66% optum.com61–64% median of 28 Proofpoint domains
Leading listed formatshare of distinct addresses in the most common listed format
50–59% optum.com83–95% median of 28 Proofpoint domains
Rejected on verificationshare of verifications rejected
16–19% optum.com14–17% median of 27 Proofpoint domains
Most common optum.com email formats
| Format | What it means | Share | 95% range | Addresses |
|---|---|---|---|---|
[email protected] | First name, dot, last name | 50–59% | 39–70% | 40+ |
[email protected] | First name, underscore, last name | 18–26% | 11–37% | 15+ |
| — | Contains digits | 6–12% | 2–22% | 5+ |
[email protected] | First name only | 6–12% | 2–22% | 5+ |
| — | Other formats, combined | 12–19% | — | 10+ |
Shares are of the 75+ distinct optum.com 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 optum.com
| Response | What it means | Share of listed responses |
|---|---|---|
250 | Mailbox accepted the addressDeliverable | 76–81% |
550 5.1.0 | Mailbox does not existUndeliverable | 20–24% |
Only answers about the mailbox itself are listed.
Catch-all
No, mostly rejects unknown mailboxes
Last checked November 3, 2026
DNS, checked November 5, 2026
MX mxa-0077b904.gslb.pphosted.com
SPF published · DMARC published
Mailbox provider Microsoft 365
Free check
Verify an address at optum.com
Type the part before the @. mailfloss asks the optum.com 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 optum.com
Optum 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 Optum use?
optum.com. Its mail is routed through Proofpoint (mxa-0077b904.gslb.pphosted.com), with SPF published and DMARC published, checked November 5, 2026.
What is the most common optum.com email format?
[email protected]: 50–59% (95% range 39–70%) of the 75+ distinct optum.com addresses mailfloss verified in the 90 days to November 6, 2026. Next: [email protected] at 18–26% and "contains digits" at 6–12%.
Is optum.com a catch-all domain?
No. In mailfloss's checks (latest November 3, 2026), optum.com mostly rejected addresses that do not exist, so it is not a catch-all domain. Because optum.com 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 optum.com addresses bounce?
Of mailfloss's optum.com verifications in the 90 days to November 6, 2026, 61–66% were accepted, 18–21% got no clear answer and 16–19% were rejected.
How do I find or check an email address at optum.com?
Build it from the person's name in the most common format, [email protected], then verify it before you send: mailfloss asks the optum.com mail server about that exact address and reports what it answered. Because optum.com is not a catch-all domain, a clear answer means what it says. Verify one now.
Does Optum 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 5, 2026.
Typo Fixer · company domains
A subscriber who typed optmu.com is still a customer of Optum.
Most verifiers mark optmu.com invalid and delete the subscriber. mailfloss's Typo Fixer suggests optum.com 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@optmu.com; Typo Fixer suggests first.last@optum.com and queues it for your approval.
Other company domains on Proofpoint
All 28 Proofpoint domains| Domain | Most common format | Accepted on verification | Catch-all |
|---|---|---|---|
| oracle.comOracle | [email protected]87–93% of addresses | 50% | catch-all: No |
| pnc.comPNC | [email protected]89–99% of addresses | 60–65% | catch-all: No |
| smith-nephew.comSmith+Nephew | [email protected]83–100% of addresses | 56–60% | catch-all: No |
| ucsf.eduUCSF | [email protected]93–96% of addresses | 63% | catch-all: No |
| 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 |
One check is a start. Keep every address on your list deliverable.
mailfloss runs this verification on your whole list, inside your email platform, and keeps running it as addresses change. Product teams and AI agents get the same checks from the API.
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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