iol.ie - Email Domain Verification & Deliverability Report

Active ISP Email Provider
Organization: Ireland On-Line
Mail Server: esat.net
Verified 4 days ago

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

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MX Records for iol.ie

PriorityMail ServerIP Address
10 hub.mail.esat.net 193.120.143.152
20 mxbackup.esat.net 193.95.142.42
SMTP Status: Responding
SMTP Banner:
220 hub02.mail.esat.net ESMTP Wed, 11 Mar 2026 08:10:04 +0000

iol.ie uses esat.net mail servers, which means emails are processed through esat.net infrastructure with their built-in spam filtering and security controls.

Email Authentication for iol.ie

SPF Record Pass

v=spf1 a a:mail.iol.ie a:webmail.email.hosting include:spf.blacknight.ie ~all
Authorized Senders:
spf.blacknight.ie

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of iol.ie.

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: iol.ie has basic email authentication in place. Additional authentication methods would strengthen protection against spoofing and improve deliverability.

WHOIS & Domain Information

Registration Details

Domain
iol.ie
TLD
.ie
Created
1999-12-13
Updated
2026-01-28
Expires
2026-12-14
Domain Age
26 years

Registrar

Name
BT Ireland
IANA ID
not applicable

Registrant Contact

Name
BT Communications Ireland Limited

Name Servers

  • auth01.ns.esat.net
  • sec01.ns.esat.net

About iol.ie

iol.ie is the email domain for Ireland On-Line (IOL), one of Ireland's earliest internet service providers. Founded in 1992, IOL was a pioneer of internet access in Ireland. The service was later acquired by BT Ireland and subsequently by eir. Legacy iol.ie email accounts continue to be maintained for existing subscribers.

iol.ie supports SPF records for sender authentication through eir infrastructure. DKIM and DMARC configurations follow standard Irish ISP practices. Proper authentication alignment is recommended for delivery to iol.ie mailboxes.

The iol.ie mail servers, managed by eir, validate recipients and apply standard anti-spam filtering including reputation scoring and content analysis.

For delivery to iol.ie, authenticate with SPF and DKIM, maintain clean lists, and comply with Irish data protection law and GDPR. Eir delivery practices apply to legacy IOL domains.

How to Verify iol.ie Email Addresses

Need to check if an email address at iol.ie actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to iol.ie'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 iol.ie Email
Use BulkEmailChecker's free email verification tool to instantly validate any iol.ie 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 iol.ie Emails in Bulk
Have a mailing list full of iol.ie 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 iol.ie Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates iol.ie 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, iol.ie is a valid email domain originally operated by Ireland On-Line (IOL), one of Ireland's first ISPs, now maintained by eir. Legacy email accounts remain active.
No, iol.ie is not a disposable or temporary email service. It is a permanent ISP email domain with legacy accounts maintained by eir for former IOL subscribers in Ireland.
iol.ie uses mail servers managed by eir infrastructure in Ireland. The MX records direct inbound email to eir-operated gateways for filtering and delivery to legacy IOL mailboxes.
You can send marketing emails to iol.ie addresses with valid opt-in consent. Authenticate with SPF and DKIM, comply with Irish data protection law and GDPR, and honor unsubscribe requests.
You can verify an iol.ie email address using an email verification service that checks MX records and performs SMTP-level validation to confirm the mailbox is active and accepting email.
The fastest and most accurate way to verify a iol.ie 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 iol.ie'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 iol.ie 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 iol.ie 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 iol.ie 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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