Domain Intelligence
Last Updated:
Oi.com.br
Safe to Send
Oi.com.br is operated by Oi Telecomunicacoes. The domain runs 1 mail exchange and SMTP is not currently responding, with all three authentication standards in force.
Safe to Send
RISK
23
/100
Low
Verify Mailbox
Verify @oi.com.br emails
Live SMTP handshake against oi.com.br mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
I run cold for an agency. We've used Hunter, NeverBounce, and ZeroBounce. This matches them on accuracy and is meaningfully cheaper at our volume. Switched everything over in March. Priya Nair
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
No
Mail server not responding to SMTP
MX Records
1
Mail exchangers
Mail Exchange (MX) Records for oi.com.br Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.
#10
mx7.oi.com.br 177.154.139.187
No Response
SMTP Handshake
Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections.
No Response
BANNER220 oi.com.br ESMTP Service Ready
Primary mail server did not respond to SMTP within the audit timeout. Mail to oi.com.br may bounce.
oi.com.br Email Authentication SPF · DKIM · DMARC
SPF
Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers.
Pass
TXTv=spf1 include:spf-oi.oi.com.br include:spf-oiint.oi.com.br a:partners.oi.com.br a:senders.oi.com.br include:sendgrid.net include:_spf.atoracle.com -all
Authorized senders are defined and pass SPF policy.
DKIM
DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS.
Pass
SELECTORDetected via standard selectors
A DKIM signature was detected. Outbound mail from this domain can be cryptographically verified.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
None
TXTv=DMARC1; p=none; rua=mailto:acdff5980d7f873@rep.dmarcanalyzer.com; ruf=mailto:acdff5980d7f873@for.dmarcanalyzer.com; sp=none; fo=1;
Monitoring only. Receivers take no action when SPF or DKIM fails.
oi.com.br Domain Registration WHOIS · Nameservers · Registrar
Last UpdatedSeptember 24, 2025
ExpiresDecember 4, 2028
Age27 years
TLD.br
Authoritative Nameservers (2)
- ns01.oi.net.br
- venus.oi.net.br
Registrant
Oi S.A. - Em Recuperação Judicial
Technical Contact
iG - Gerencia de Datacenter
About this Domain
About oi.com.br
oi.com.br is a Brazilian ISP domain from Oi (formerly Telemar), one of Brazil's largest telecommunications companies based in Rio de Janeiro. Oi provides broadband, mobile, and TV services across Brazil.
oi.com.br implements SPF authentication. Compliant with Brazil's LGPD.
The mail servers validate recipients and reject invalid addresses. The domain does not operate as catch-all.
For delivery, authenticate with SPF. Comply with LGPD.
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Common Questions About oi.com.br
Is oi.com.br a disposable or temporary email provider?
No. oi.com.br is not a disposable email provider. It is classified as ISP Email Provider operated by Oi Telecomunicacoes and addresses on oi.com.br are persistent rather than throwaway. Mail sent to a valid oi.com.br mailbox reaches a real recipient.
How do I verify if a oi.com.br email address is valid?
The fastest way to verify a oi.com.br email address is to use our free email checker. Enter any @oi.com.br mailbox at the top of this page and our system performs a real-time SMTP handshake against oi.com.br's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a oi.com.br email exists without sending a message?
Yes. Our real-time email verification API connects directly to oi.com.br's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the oi.com.br mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for oi.com.br?
oi.com.br currently publishes 1 mail exchange (MX) record. The primary MX is mx7.oi.com.br, which is the first server contacted when other mail systems try to deliver email to a oi.com.br address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for oi.com.br.
Does oi.com.br use SPF, DKIM, and DMARC email authentication?
oi.com.br enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: none). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @oi.com.br is genuine, and oi.com.br's DMARC policy of 'none' instructs receivers how to handle messages that fail those checks.
Why do emails to oi.com.br bounce or get blocked?
Bounces from oi.com.br usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to oi.com.br's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so oi.com.br's receivers trust you.
How can I verify a large list of oi.com.br email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of oi.com.br addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, oi.com.br catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from oi.com.br email addresses?
Yes, with normal hygiene. oi.com.br is a legitimate email service and signups from @oi.com.br behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block oi.com.br by default.
What email format does oi.com.br use for usernames?
Most oi.com.br mailboxes follow common patterns like first.last@oi.com.br, firstinitiallast@oi.com.br, or first@oi.com.br, but the actual local-part rules depend on Oi Telecomunicacoes. The only reliable way to confirm whether a specific @oi.com.br address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the oi.com.br risk score calculated?
The 0-to-100 risk score for oi.com.br combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The oi.com.br score is recomputed on every audit so it always reflects the live state of the domain.
Is oi.com.br a valid ISP email domain?
Yes, oi.com.br is a valid email domain provided by Oi Telecomunicacoes to its internet subscribers. It is a legitimate ISP-issued email address.
Is oi.com.br a disposable or temporary email provider?
No, oi.com.br is not a disposable or temporary email provider. It is an ISP-provided email service tied to an internet subscription from Oi Telecomunicacoes.
What mail server does oi.com.br use?
oi.com.br uses mail servers operated by Oi Telecomunicacoes. Check the MX records section above for specific server details and authentication configuration.
Can I send marketing emails to oi.com.br addresses?
Yes, you can send marketing emails to oi.com.br 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.
How do I verify an email address at oi.com.br?
Use BulkEmailChecker to verify oi.com.br addresses via SMTP checks. ISP domains may have specific rate limiting or greylisting behaviors. Our tool handles these provider-specific configurations automatically.