ctbc.com.br - Email Domain Verification & Deliverability Report

Active ISP Email Provider
Organization: CTBC Telecom
Mail Server: Google Workspace
Verified 2 days ago

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

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MX Records for ctbc.com.br

PriorityMail ServerIP Address
1 ASPMX.L.GOOGLE.COM 172.253.115.27
5 ALT2.ASPMX.L.GOOGLE.COM 172.253.116.27
5 ALT1.ASPMX.L.GOOGLE.COM 108.177.123.26
10 ALT4.ASPMX.L.GOOGLE.COM 173.194.76.26
10 ALT3.ASPMX.L.GOOGLE.COM 192.178.223.26
SMTP Status: Responding
SMTP Banner:
220 mx.google.com ESMTP 6a1803df08f44-8ae6ceb1cedsi23592946d6.325 - gsmtp

ctbc.com.br uses Google Workspace mail servers, which means emails are processed through Google Workspace infrastructure with their built-in spam filtering and security controls.

Email Authentication for ctbc.com.br

SPF Record Pass

v=spf1 ip4:200.225.197.0/24 ip4:200.170.137.98 ip4:200.170.169.128 ip4:201.16.216.25 ip4:200.225.223.133 ip4:189.112.116.11 ip4:189.112.116.121 ip4:189.112.116.124 ip4:189.112.116.125 include:17386.meuspf.com ip4:189.112.116.126 ip4:189.112.116.127 ip4:189.112.116.128 include:spf.protection.outlook.com include:_spf.google.com a mx -all
Authorized Senders:
17386.meuspf.com spf.protection.outlook.com _spf.google.com

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

DMARC Record Missing

No DMARC record found for this domain.

DKIM Not Detected

DKIM detection is limited from external scanning. The domain may use DKIM with selectors not covered by our scan.

Authentication Summary: ctbc.com.br has basic email authentication in place. Additional authentication methods would strengthen protection against spoofing and improve deliverability.

WHOIS & Domain Information

Registration Details

Domain
ctbc.com.br
TLD
.br

Registrar

About ctbc.com.br

ctbc.com.br is the email domain for CTBC Telecom (now Algar Telecom), a Brazilian telecommunications company based in Uberlandia, Minas Gerais. Algar Telecom provides broadband internet, mobile, TV, and voice services primarily in the Minas Gerais Triangle and other regions. Email accounts on ctbc.com.br continue to serve legacy subscribers.

ctbc.com.br supports SPF authentication through Algar Telecom infrastructure. DKIM and DMARC configurations follow standard Brazilian telecom practices. Proper authentication alignment is recommended for delivery to ctbc.com.br mailboxes.

The ctbc.com.br mail servers validate recipients at the SMTP level, rejecting invalid addresses. Anti-spam filtering includes reputation scoring, content analysis, and authentication verification.

For delivery to ctbc.com.br, authenticate with SPF and DKIM, maintain clean lists, and comply with Brazil's LGPD data protection law and Marco Civil da Internet for commercial email communications.

How to Verify ctbc.com.br Email Addresses

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Verify ctbc.com.br Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates ctbc.com.br 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, ctbc.com.br is a valid email domain originally operated by CTBC Telecom, now maintained by Algar Telecom. Legacy email accounts remain active for subscribers in the Minas Gerais region of Brazil.
No, ctbc.com.br is not a disposable or temporary email service. It is a permanent ISP email domain maintained by Algar Telecom for legacy CTBC subscribers in Brazil.
ctbc.com.br uses mail servers managed by Algar Telecom infrastructure in Brazil. The MX records direct inbound email to Algar-operated gateways for filtering and delivery.
You can send marketing emails to ctbc.com.br addresses with valid opt-in consent. Authenticate with SPF and DKIM, comply with Brazil's LGPD, and provide clear unsubscribe mechanisms.
You can verify a ctbc.com.br email address using an email verification tool that checks MX records and performs SMTP-level validation to confirm the mailbox is active and deliverable.
The fastest and most accurate way to verify a ctbc.com.br 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 ctbc.com.br'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 ctbc.com.br 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 ctbc.com.br 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 ctbc.com.br 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.

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