--- title: "ESET Mail Security for HCL Domino Replacement Options: 2026 buyer's guide | DuoCircle" description: "Honest comparison of replacement options for ESET Mail Security for IBM/HCL Domino before its July 31, 2026 End of Life. On-server vs gateway, vendor fit by shop size, where DuoCircle is and is not the right answer." image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/email/eset-mail-security-domino-replacement-comparison/" --- ESET Mail Security for HCL Domino · 2026 replacement options # Two architectures. Then the vendor choice. ESET Mail Security for IBM/HCL Domino reaches full End of Life on July 31, 2026\. The replacement question is two questions. First, on-server or cloud gateway. Then, which vendor inside that category. This page is the honest side-by-side, including where we are not the right answer. [ Request a Quote → ](/email/spamsentinel-quote/) [ See the EOL context ](/email/eset-mail-security-domino-end-of-life/) 1 on-server option 5 gateway options 2 architectures not relevant for Domino replacement candidates · ESET to ? On-server, native 1 option SpamSentinel (DuoCircle) running on Domino since 2003 Cloud gateway 5 options · Proofpoint Essentials · Mimecast · Barracuda Email Protection · Trustifi · Phish Protection (DuoCircle) Not relevant for Domino 2 categories · API (M365 / Workspace): Avanan, Vade · Doing nothing past Jul 31, 2026 Honest comparison updated May 13, 2026 On-server option ## SpamSentinel: the like-for-like replacement This is our product. We will keep the description factual and tell you where it is not the right fit. SpamSentinel is, as far as we know, the last actively-maintained on-server Domino mail security product, which is why this section has one entry and not three. ### SpamSentinel (DuoCircle) Native install on HCL Domino. Spam filtering, anti-phishing, anti-malware, macro blocking, InboxGenius. Direct ESET replacement Acquired by DuoCircle from Maysoft in September 2024 on the explicit condition that we take care of the existing customers and not damage what was built. Running on Domino since 2003\. Same architecture as ESET (Domino-integrated application). The smallest possible migration: install alongside ESET, configure while ESET is active, swap with a notes.ini edit and Domino restart, decommission ESET. No MX changes. #### Strengths - Same mail flow as ESET. Smallest possible migration. - Built-in macro blocking based on a default-deny model, recognizing that heavily obfuscated Office macros cannot be reliably classified through automated inspection alone. - InboxGenius preferred-sender learning reduces the false-positive triage burden on the help desk. - Managed from the Domino administrative client by the team that already runs Domino. - Reference calls with existing customers available on request. #### Not the right answer if - × You have decided to switch architectures to a cloud gateway. - × You are actively migrating off Domino in the next 12 months. See Tenant Migration. - × You are on Microsoft 365 (see Phishing Protection and Spam Filtering). - × You are on Google Workspace (stay with Google's built-in). Pricing on the call, not in a downstream sales process. [SpamSentinel product page →](/email/lotus-notes-email-security/) Cloud gateway shortlist ## If you are switching architectures Lots of vendors compete here. All five below run as MX-based gateways and work back-end agnostic, so they sit in front of Domino without platform-specific integration. We have a strong opinion that this should be a deliberate architecture choice, not an accident. We do not have a strong opinion about which of these is best for you. ### Proofpoint Essentials Strong threat intel, recognized brand Quoted (mid to enterprise) **Strengths.** Strong threat intelligence from Proofpoint research. Mature quarantine and policy controls. Recognized brand if your security committee insists on a name they know. **Caveats.** Pricing typically opaque and quoted per organization. For shops under 100 to 200 mailboxes, total cost of ownership often runs higher than smaller-mid-market alternatives. ### Mimecast Bundles archiving and continuity Quoted (mid to enterprise) **Strengths.** Broad, mature feature set, especially if you also need email archiving or business continuity. Strong reputation in regulated industries. **Caveats.** Pricing tends toward the higher end, especially once you add archiving or continuity. Product surface is large; if you only need to replace ESET's scanning, you may pay for capabilities you will not use. ### Barracuda Email Protection SMB and mid-market default Mid-market **Strengths.** Reasonable mid-market pricing. Recognized brand in SMB and mid-market. Bundled offerings if you also need backup or archiving. **Caveats.** Detection quality varies by tier; lower tiers are not always competitive with multi-engine alternatives. Sales motion can push you up tiers more aggressively than some shops want. ### Trustifi Combined inbound + outbound encryption Mid-market **Strengths.** Combined inbound security and outbound encryption in one product. Reasonable pricing for the bundled feature set. **Caveats.** If you only need inbound replacement for ESET, you may pay for outbound encryption you do not need. Less established brand than the larger competitors. ### Phish Protection (DuoCircle) Our own gateway product From $19 per user per month **Strengths.** Multi-engine detection (Vade Secure, Sophos, Halon Classify, Webroot BCTI). Time-of-click URL protection. Self-serve 60-day trial, no sales call required. Public pricing. **Caveats.** If you want an on-server replacement for ESET, you want SpamSentinel, not Phish Protection. Different architectures, different products. **Not relevant for Domino:** Avanan (Check Point Harmony Email) and Vade are API-based products that integrate with Microsoft 365 and Google Workspace via vendor APIs. They do not have a meaningful HCL Domino integration. We are mentioning them so you know not to chase them as ESET replacements for a Domino environment. If your ESET migration is paired with a move to Microsoft 365, they become candidates for the M365 environment. Comparison at a glance ## All nine options in one table The "doing nothing past July 31, 2026" row is in the table on purpose. It is not a recommendation. It is the line item your auditors will see. | Product | Architecture | Domino-native | Domino-compatible | Maintained for Domino | Pricing | | ---------------------------------------------- | -------------------------- | ------------- | ----------------- | --------------------- | --------------- | | SpamSentinel (DuoCircle) RECOMMENDED ON-SERVER | On-server, native | ✓ | ✓ | ✓ | Talk to us | | Proofpoint Essentials | Cloud gateway | no | ✓ | n/a | Quoted | | Mimecast | Cloud gateway | no | ✓ | n/a | Quoted | | Barracuda Email Protection | Cloud gateway | no | ✓ | n/a | Mid-market | | Trustifi | Cloud gateway + encryption | no | ✓ | n/a | Mid-market | | Phish Protection (DuoCircle) | Cloud gateway | no | ✓ | n/a | $19 per user/mo | | Avanan / Check Point Harmony | API (M365 / Workspace) | no | no | n/a | Mid-market | | Vade | API (M365 / Workspace) | no | no | n/a | Mid-market | | Doing nothing past July 31, 2026 | Unsupported on-server | no | n/a | no, frozen since 2023 | Audit exposure | How to choose ## A short decision tree Four questions. Each one narrows the shortlist. By the bottom you have one or two products to evaluate, not ten. Q1 ### Are you staying on Domino? Yes / first path Choose between SpamSentinel (on-server) and a cloud gateway (architectural change). Continue. No / second path Your email security strategy lives inside the platform migration. Pick the product that fits the destination. See Tenant Migration. Q2 ### Do you want to keep the on-server architecture or switch? Yes / first path Keep on-server, fastest path: SpamSentinel. No / second path Switch to gateway, willing to take on a 4-to-8 week project: pick from the gateway shortlist below. Q3 ### Going gateway? How big is your shop? Yes / first path Under 250 mailboxes: Phish Protection, Trustifi, or Barracuda. 250 to 2000: any of the gateways. Over 2000: Proofpoint or Mimecast are typical defaults. Q4 ### Do you also need archiving or continuity? Yes / first path Mimecast bundles these and is worth the conversation. No / second path Do not let a vendor talk you into them. Separate problems. **On the EOL clock:** SpamSentinel is the fastest path (3 to 5 weeks, no DNS changes). Self-serve gateway products like Phish Protection can be in pilot the same week you start. Sales-led enterprise gateways take longer purely on procurement, even before any technical work begins. Where to go from here ## Pick the door that fits your decision **SpamSentinel is the right fit (staying on Domino, lowest-risk migration):** [request a SpamSentinel quote](/email/spamsentinel-quote/). Same-day response from an expert who has actually deployed it on Domino. **Evaluating the gateway path:** any of the five gateway vendors above will engage with you directly. We will tell you honestly when one of them is a better fit for your shop than our own Phish Protection. **Want the full technical playbook for ESET to SpamSentinel migration:** see the [migration guide](/email/eset-mail-security-domino-migration-guide/). **Want the EOL context and the verified ESET timeline:** see the [End of Life page](/email/eset-mail-security-domino-end-of-life/). ## Honest answer, even when it is not us. Request a SpamSentinel quote. Tell us your Domino version, your user count, and what else you are evaluating. If we are the right fit, we will tell you. If we are not, we will point you at the vendor who is. [Request a Quote→](/email/spamsentinel-quote/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. Trusted by 50,000+ organizations since 2014.","subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}],"sameAs":["https://www.linkedin.com/company/duocircle","https://x.com/duocirclellc","https://www.facebook.com/duocirclellc","https://www.g2.com/products/phish-protection-by-duocircle/reviews","https://github.com/duocircle","https://www.crunchbase.com/organization/duocircle-llc"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://support.duocircle.com"},"knowsAbout":["Email Security","Email Authentication","SPF","DKIM","DMARC","Phishing Protection","Spam Filtering","SMTP Relay","Email Deliverability","Email Forwarding"]} ``` ```json {"@context":"https://schema.org","@type":"WebSite","name":"DuoCircle LLC","url":"https://www.duocircle.com","description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. Trusted by 50,000+ organizations since 2014.","publisher":{"@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. Trusted by 50,000+ organizations since 2014.","subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}} ``` ```json [{"@context":"https://schema.org","@type":"Article","headline":"ESET Mail Security for HCL Domino Replacement Options: 2026 buyer's guide","description":"Honest side-by-side of replacement products for ESET Mail Security for IBM/HCL Domino. On-server vs gateway architectures, vendor shortlist, decision tree.","url":"https://www.duocircle.com/email/eset-mail-security-domino-replacement-comparison/","author":{"@type":"Organization","name":"DuoCircle"}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"DuoCircle","item":"https://www.duocircle.com"},{"@type":"ListItem","position":2,"name":"HCL Notes / Domino","item":"https://www.duocircle.com/email/lotus-notes-email-security/"},{"@type":"ListItem","position":3,"name":"ESET Replacement Comparison","item":"https://www.duocircle.com/email/eset-mail-security-domino-replacement-comparison/"}]}] ```