Yes. You can verify any @Optonline.net address in real time with a direct SMTP handshake that provides 99.7% accuracy. Optonline.net is operated by Altice USA / Optimum, runs 1 mail server, enforces 2 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
optonline.net publishes 1 MX record. The primary mail exchanger is mx.altice.prod.cloud.openwave.ai, hosted by openwave.ai, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | mx.altice.prod.cloud.openwave.ai | 66.179.105.18 | Reachable |
220 altprdrgi012.altice.prod.cloud.openwave.ai ESMTP Service readyYes. optonline.net is a valid email domain, operated by Altice USA / Optimum. Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to Optonline.net's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Free inboxes get abandoned constantly. Verification drops the dead optonline.net mailboxes before you mail them.
Mistyped optonline.net addresses fail a real SMTP check, so they never turn into a hard bounce.
A clean list keeps your bounce rate low, and a low bounce rate is what protects inbox placement on a big send.
Mailing only live optonline.net addresses raises every rate that matters: opens, clicks, and replies.
Optonline.net is Altice USA / Optimum, registered through GoDaddy.com, LLC and first seen Oct 6, 1996.
optonline.net is a U.S. ISP domain from Optimum Online (Altice USA), serving broadband subscribers in the New York metropolitan area. The domain is part of Altice's Optimum brand.
optonline.net implements SPF authentication through Altice infrastructure.
The mail servers validate recipients and reject invalid addresses. The domain does not function as catch-all.
For delivery, authenticate with SPF. Follow CAN-SPAM requirements.
Upload a CSV or TXT list of Optonline.net addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Optonline.net address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
Yes, optonline.net is a valid email domain provided by Altice USA / Optimum to its internet subscribers. It is a legitimate ISP-issued email address.
No, optonline.net is not a disposable or temporary email provider. It is an ISP-provided email service tied to an internet subscription from Altice USA / Optimum.
optonline.net uses mail servers operated by Altice USA / Optimum. Check the MX records section above for specific server details and authentication configuration.
Yes, you can send marketing emails to optonline.net 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 optonline.net addresses via SMTP checks. ISP domains may have specific rate limiting or greylisting behaviors. Our tool handles these provider-specific configurations automatically.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with optonline.net's mail servers, the same engine that has verified billions of addresses since 2012.
Other isp email provider domains we have audited.