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Twilio.com

Safe to Send

Twilio.com is operated by Twilio Inc.. The domain runs 2 mail exchanges and SMTP is responsive, with all three authentication standards in force.

Safe to Send
Verify Mailbox

Verify @twilio.com emails

Live SMTP handshake against twilio.com mail servers. No email is sent. 10 free per day, no signup.

@twilio.com
No email sent No signup Real-time SMTP

Trusted by 400,000+ senders

4.9/5
From 8,500+ verified reviews
Compliance approved this in two weeks thanks to SOC 2 Type II and the GDPR documentation. Verification accuracy holds at the advertised 99%+ across our 80k physician contact list. Dana Mehta · IT Director, Healthcare
SOC 2 Type II GDPR CCPA 99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
2
Mail exchangers

Mail Exchange (MX) Records for twilio.com 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.

2 RECORDS
#10
mxb-0023de01.gslb.pphosted.com 148.163.153.13
Reachable
#10
mxa-0023de01.gslb.pphosted.com 148.163.153.13
Reachable
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. Responsive
BANNER220 mx0b-0023de01.pphosted.com ESMTP mfa-m0198306
Primary mail server accepted SMTP connection and returned a banner during the live audit.

twilio.com Email Authentication SPF · DKIM · DMARC

3/3 PASS
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:twilio.com._nspf.vali.email include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~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. Reject
TXTv=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email; ruf=mailto:dmarc@twilio.com
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.

twilio.com Domain Registration WHOIS · Nameservers · Registrar

18 YEARS OLD
RegistrarMarkMonitor, Inc.
IANA ID292
RegisteredOctober 26, 2007
Last UpdatedSeptember 24, 2024
ExpiresOctober 25, 2026
Age18 years
TLD.com
Authoritative Nameservers (6)
  • ns0.dnsmadeeasy.com
  • a24-65.akam.net
  • ns1.dnsmadeeasy.com
  • ns2.dnsmadeeasy.com
  • a1-83.akam.net
  • a11-64.akam.net
Registrant
Twilio Inc.
UNITED STATES
Technical Contact
Hidden by registrar privacy service
About this Domain

About twilio.com

Twilio Inc. (twilio.com) is a cloud communications platform headquartered in San Francisco, California. Twilio provides APIs for voice, messaging, video, email (via SendGrid), and authentication services used by over 300,000 businesses. As the operator of one of the world's largest email delivery platforms through SendGrid, Twilio has deep expertise in email infrastructure and deliverability.

Twilio implements comprehensive email authentication on the twilio.com domain with SPF, DKIM, and DMARC enforcement. As a company that literally operates email sending infrastructure for others, Twilio applies best-in-class email security practices to its own corporate domain, serving as a model for proper authentication configuration.

SMTP verification of twilio.com addresses returns definitive responses for valid and invalid mailboxes. The domain does not function as catch-all. Twilio's mail infrastructure includes enterprise rate limiting on inbound SMTP connections.

Delivering to twilio.com requires impeccable sender authentication. Given Twilio's deep expertise in email deliverability and security, their corporate filters apply sophisticated evaluation of incoming messages. Full SPF, DKIM, and DMARC compliance with strong sender reputation is essential for reliable inbox delivery.

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Common Questions About twilio.com

Is twilio.com a disposable or temporary email provider?
No. twilio.com is not a disposable email provider. It is classified as Corporate Email operated by Twilio Inc. and addresses on twilio.com are persistent rather than throwaway. Mail sent to a valid twilio.com mailbox reaches a real recipient.
How do I verify if a twilio.com email address is valid?
The fastest way to verify a twilio.com email address is to use our free email checker. Enter any @twilio.com mailbox at the top of this page and our system performs a real-time SMTP handshake against twilio.com'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 twilio.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to twilio.com'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 twilio.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for twilio.com?
twilio.com currently publishes 2 mail exchange (MX) records. The primary MX is mxb-0023de01.gslb.pphosted.com, which is the first server contacted when other mail systems try to deliver email to a twilio.com 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 twilio.com.
Does twilio.com use SPF, DKIM, and DMARC email authentication?
twilio.com enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: reject). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @twilio.com is genuine, and twilio.com's DMARC policy of 'reject' instructs receivers how to handle messages that fail those checks.
Why do emails to twilio.com bounce or get blocked?
Bounces from twilio.com 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 twilio.com'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 twilio.com's receivers trust you.
How can I verify a large list of twilio.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of twilio.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, twilio.com 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 twilio.com email addresses?
Yes, with normal hygiene. twilio.com is a legitimate email service and signups from @twilio.com 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 twilio.com by default.
What email format does twilio.com use for usernames?
Most twilio.com mailboxes follow common patterns like first.last@twilio.com, firstinitiallast@twilio.com, or first@twilio.com, but the actual local-part rules depend on Twilio Inc.. The only reliable way to confirm whether a specific @twilio.com 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 twilio.com risk score calculated?
The 0-to-100 risk score for twilio.com 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 twilio.com score is recomputed on every audit so it always reflects the live state of the domain.
Is twilio.com a valid email domain?
Yes, twilio.com is the official corporate email domain for Twilio Inc.. It is used for business communications and is not available for public registration.
Is twilio.com a disposable or temporary email provider?
No, twilio.com is a corporate email domain belonging to Twilio Inc., used exclusively by employees and authorized personnel.
What mail server does twilio.com use?
twilio.com uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
Can I send marketing emails to twilio.com addresses?
B2B marketing to twilio.com addresses requires proper consent and compliance with anti-spam laws. Corporate domains may use catch-all configurations, so verify addresses before sending.
How do I verify an email address at twilio.com?
Corporate domains like twilio.com may use catch-all configurations. Use BulkEmailChecker advanced verification to detect catch-all behavior and validate individual addresses.