other · AU

Optus

Singtel Optus Pty Limited

Australian telecommunications.

Primary official domain
optus.com.au
Reviewed official domains
1 (directory review; organization has not verified)
Directory source
DomainSpoof directory · Suggest a correction
Matching domains, 30 days
0
registrable domains containing the brand; source date or last feed observation
First source-reported, 30 days
0
domains first source-reported within 30 days
First observed, 30 days
5
domains first observed by DomainSpoof in feeds
Email policy (primary domain)
DMARC reject
SPF ~all · 3/10 lookups · checked 2026-10-18 · published policy

What we watch for

Hostnames in phishing feeds and certificate logs are matched on these brand tokens; feed target labels are matched on the aliases. Generated spellings (typos, lure words, look-alike characters, other top-level domains) are derived from the official domains and tokens and checked against feeds, certificate logs and DNS.

Brand tokens
optus
Label aliases
Optus
Official domains
optus.com.au (all)
Generated spellings
84 tracked · 0 observed somewhere · 84 not observed (all)

Official domains and email policies

Domains reviewed as belonging to Optus. DMARC helps receivers check the From domain; lookalike domains remain possible. Published policies cannot confirm actual mail configuration or receiver behavior.

DomainRelationshipEvidenceDMARC policyPolicy sourceSPFReportingLast check
optus.com.au
primaryReviewed 2026-10-18
DomainSpoof directory (seed)rejectDirect~all · 3/10 lookupsAggregate reports requested (rua)2026-10-18 22:03 UTC
Records and check details

Published records

DMARC (_dmarc.optus.com.au)
v=DMARC1;p=reject;rua=mailto:…@optus.com.au;ruf=mailto:…@optus.com.au
SPF (optus.com.au)
v=spf1 ip4:203.13.128.0/24 ip4:199.59.64.200/32 ip4:199.59.64.16/32 a:mail.optus.com.au include:au._netblocks.mimecast.com include:mktomail.com ~all
DKIM
Unknown (no known selector). DKIM use requires a known selector or message to assess; a published key alone cannot confirm signing.

Interpretation

  • p=reject: receivers are asked to reject failing mail.
  • Relaxed DKIM alignment (default).
  • Relaxed SPF alignment (default).
  • ~all (softfail): unlisted hosts are marked suspicious; this is not +all and does not by itself bypass DMARC.
  • 3 DNS-querying terms (include, a, mx, ptr, exists, redirect), counted recursively; the limit is 10.
  • Checked with an earlier assessment that did not validate IP mechanism syntax or resolve a/mx/exists targets; it is re-assessed on the next check.

DMARC discovery (RFC 9989 tree walk)

  1. _dmarc.optus.com.au: ok, 1 DMARC record

Recent checks

  • 2026-10-18 22:03 UTC: DMARC reject; SPF ~all

Assessment posture-v1. DNS lookup failures leave the policy unknown.

“Not checked”: no check yet. “Lookup failed”: DNS result unknown. Report mailbox names are redacted.

Reports on official domains appear under “Official assets with reports” on the Reported matches tab.