optus.com.au - Email Domain Verification & Deliverability Report

Active ISP Email Provider
Organization: Optus
Mail Server: fireeyecloud.com
Verified 3 days ago

Real-time verification data for optus.com.au. View MX records, SPF/DKIM/DMARC authentication, and server deliverability status.

Email Verification Tool
LIVE
SMTP Check
Mailbox Detection
Disposable Check
No Email Sent

MX Records for optus.com.au

PriorityMail ServerIP Address
20 mx.emea.email.fireeyecloud.com 63.34.218.9
SMTP Status: Responding
SMTP Banner:
220 2.0.0 mx.emea.email.fireeyecloud.com ESMTP

optus.com.au uses fireeyecloud.com mail servers, which means emails are processed through fireeyecloud.com infrastructure with their built-in spam filtering and security controls.

Email Authentication for optus.com.au

SPF Record Pass

v=spf1 ip4:203.13.126.0/24 ip4:203.13.128.0/24 ip4:180.92.216.0/21 ip4:202.160.119.160/28 ip4:199.59.64.200/32 ip4:199.59.64.16/32 ip6:2400:1200:1:123::/64 include:rnmk.com a:mail.optus.com.au include:mktomail.com include:us.khoros-mail.com ~all
Authorized Senders:
rnmk.com mktomail.com us.khoros-mail.com

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of optus.com.au.

DMARC Record Reject

v=DMARC1;p=reject;rua=mailto:dmarc@optus.com.au;ruf=mailto:mailauth-forensics@optus.com.au

DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail authentication checks.

DKIM Found

DKIM signatures were detected for optus.com.au, confirming that this domain cryptographically signs outgoing emails.

Authentication Summary: optus.com.au has full email authentication configured with SPF, DMARC, and DKIM. This provides strong protection against email spoofing and phishing. Emails sent from this domain are well-authenticated and likely to have high deliverability.

WHOIS & Domain Information

Registration Details

Domain
optus.com.au
TLD
.au
Updated
2025-10-27

Registrar

Name
Corporation Service Company (Aust) Pty Ltd
IANA ID
1298

Registrant Contact

Name
Domain Administrator
Organization
OPTUS MOBILE PTY LIMITED

Technical Contact

Name
Domain Administrator

Name Servers

  • dns1.optus.net.au
  • dns0.optus.net.au
  • a1-84.akam.net
  • a14-67.akam.net
  • a3-64.akam.net
  • a4-65.akam.net
  • a5-66.akam.net
  • a8-67.akam.net

About optus.com.au

optus.com.au is an Australian ISP domain from Optus, Australia's second-largest telecommunications company and subsidiary of Singapore Telecommunications (Singtel). Based in Sydney, Optus provides mobile, broadband, and enterprise services.

optus.com.au implements SPF authentication. Compliant with Australian Privacy Principles.

The mail servers validate recipients and reject invalid addresses. The domain does not operate as catch-all.

For delivery, authenticate with SPF. Comply with Australia's Spam Act 2003.

How to Verify optus.com.au Email Addresses

Need to check if an email address at optus.com.au actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to optus.com.au's mail servers to confirm the mailbox is real, active, and able to receive your message. No test email is ever sent, so your sender reputation stays protected.

Verify a Single optus.com.au Email
Use BulkEmailChecker's free email verification tool to instantly validate any optus.com.au address. You'll get a complete deliverability report including mailbox existence, catch-all detection, disposable domain flagging, and risk scoring, all in under 3 seconds.

Verify a List of optus.com.au Emails in Bulk
Have a mailing list full of optus.com.au addresses? Upload your CSV or TXT file to BulkEmailChecker and verify thousands of email addresses in minutes. Our bulk verification engine runs 30+ checks per address including syntax validation, DNS resolution, SMTP handshake, and spam trap detection. Clean your list before every campaign to keep bounce rates below 2% and protect your sender score. See bulk pricing.

Verify optus.com.au Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates optus.com.au email addresses at the point of entry, blocking invalid, disposable, and risky addresses before they enter your database. Integrate with a single API call and prevent bad data at the source.

Frequently Asked Questions

Yes, optus.com.au is a valid email domain provided by Optus to its internet subscribers. It is a legitimate ISP-issued email address.
No, optus.com.au is not a disposable or temporary email provider. It is an ISP-provided email service tied to an internet subscription from Optus.
optus.com.au uses mail servers operated by Optus. Check the MX records section above for specific server details and authentication configuration.
Yes, you can send marketing emails to optus.com.au addresses with proper opt-in consent. ISP email providers apply spam filtering, and addresses may become inactive if subscribers cancel their internet service. Regular list verification is recommended.
Use BulkEmailChecker to verify optus.com.au addresses via SMTP checks. ISP domains may have specific rate limiting or greylisting behaviors. Our tool handles these provider-specific configurations automatically.
The fastest and most accurate way to verify a optus.com.au email address is to use BulkEmailChecker's free email verification tool. Simply enter the full email address and our system performs SMTP-level validation by connecting directly to optus.com.au's mail servers. You'll get instant results showing whether the mailbox exists, is deliverable, and is safe to send to, all without sending a single email.
Yes. BulkEmailChecker uses SMTP verification to check if a optus.com.au mailbox exists without ever delivering an email. Our system connects to the domain's mail server, performs an SMTP handshake, and queries the mail server to confirm whether the recipient address is valid. This process is completely invisible to the email recipient and does not affect your sender reputation.
Sending to invalid email addresses causes hard bounces, which directly damage your sender reputation. Internet Service Providers (ISPs) and email providers track your bounce rate, and if it exceeds 2%, your emails may start landing in spam folders or get blocked entirely. Verifying optus.com.au addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
BulkEmailChecker's bulk verification service lets you upload a CSV or TXT file containing thousands of optus.com.au email addresses and verify them all at once. Each address goes through 30+ verification checks including syntax validation, DNS/MX lookup, SMTP verification, disposable domain detection, and spam trap identification. Results are typically ready within minutes and can be downloaded as a clean, verified list.
Email verification is the process of confirming that an email address is real, properly formatted, and capable of receiving messages. It matters because sending to invalid addresses causes bounces, damages your sender reputation, wastes marketing budget, and can get your sending IP blacklisted. BulkEmailChecker verifies addresses at the SMTP level, the most accurate method available, ensuring your emails reach real people.
MX (Mail Exchange) records are DNS entries that specify which mail servers are responsible for receiving email for a domain. When you send an email, your mail server looks up the recipient domain's MX records to find where to deliver the message. If a domain has no MX records, it cannot receive email. BulkEmailChecker checks MX records as part of every verification to confirm the domain is configured for email delivery.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, regardless of whether the specific mailbox exists. This makes it harder to verify individual addresses because the server always responds positively. BulkEmailChecker detects catch-all configurations and flags them in verification results so you can make informed decisions about sending to those addresses.
Yes. BulkEmailChecker offers a real-time email verification API that you can integrate into signup forms, CRM systems, lead capture tools, and any application that collects email addresses. The API validates addresses at the point of entry, blocking invalid, disposable, and risky emails before they enter your database. Integration takes just a single API call with response times under 3 seconds.

Related Domains

excitel.com
Excitel Broadband
isp
mediacom.net
Mediacom Communications
isp
chol.com
Chollian
isp
hathway.com
Hathway Cable
isp
consolidated.net
Consolidated Communications
isp
so-net.net.tw
So-net Taiwan
isp
jazztel.com
Jazztel
isp
o2online.de
O2 Germany
isp
Browse all ISP Email Provider domains

Need to Verify More @optus.com.au Emails?

Verify any email address instantly for deliverability, catch-all detection, and inbox verification.

Free @optus.com.au Checker View Bulk Pricing
No Credit Card Required 99.7% Accuracy Real-time API Available
ISO 27001 Security Certified
SOC 2 Type II Auditor Verified
GDPR Fully Compliant
CCPA Privacy Ready
HIPAA Healthcare Ready
AES-256 Encryption