# iBlockSpam

> iBlockSpam is business email protection priced per domain, with unlimited mailboxes: MX-level inbound filtering of spam, phishing, malware and spoofing, a personal quarantine for every user, guided setup for Microsoft 365, Google Workspace, cPanel/WHM and Exchange, and ongoing DNS configuration monitoring. A product of BroadNet.

Pricing, every guide, tool, feature, platform, solution and comparison page, the SPF, DKIM and SMTP error pages and the main company pages have a clean Markdown copy at the same URL with ".md" added (for example https://iblockspam.com/pricing.md). Hub and listing pages (/blog, /tools, /spf, /dkim, /glossary), the research page, contact, the demo, status and legal pages don't. The HTML page is the canonical URL to cite.

## Key facts
- Protect: $12 per domain/month billed annually ($144/year) or $15 month-to-month.
- Protect Plus: $19 per domain/month billed annually ($228/year) or $24 month-to-month. Adds daily DNS monitoring, a monthly owner report and a human setup session.
- Beta pricing in USD, excluding tax. Partners (MSPs, web hosts): partner terms, including pricing, are agreed individually; apply at https://iblockspam.com/partners/apply.
- Billing is live (Stripe): one subscription per domain, renews automatically, cancel any time in the billing portal (effective at the end of the period).
- 30-day money-back guarantee on a domain's first annual subscription; refund on request within 14 days of an annual renewal. Month-to-month fees aren't refundable. No free trial. Details: https://iblockspam.com/pricing and https://iblockspam.com/legal/refund-policy
- Included per domain per month: 100,000 inbound messages, 400 MB maximum message size, 500 outbound relay messages. Unlimited mailboxes means mailbox count, not unlimited volume. Unlimited domain aliases.
- If your mail server is down, mail is held for up to 5 days. 30-day message history. Mail is processed in the United States.
- Works with Microsoft 365, Google Workspace, cPanel/WHM, Exchange and other mail servers. Setup is an MX change plus guided platform steps.
- Contact: sales@iblockspam.com (sales), support@iblockspam.com (support), https://iblockspam.com/contact

## Main pages
- [Pricing](https://iblockspam.com/pricing): Protect and Protect Plus, per-domain pricing, limits and plan comparison
- [How iBlockSpam works](https://iblockspam.com/how-it-works): How iBlockSpam filters inbound email at the MX level: check your domain, configure routing, verify delivery, then monitor DNS for drift.
- [Why iBlockSpam](https://iblockspam.com/why-iblockspam): Why businesses choose iBlockSpam: per-domain pricing, guided setup with rollback, personal quarantines, ongoing DNS checks and honest limits.
- [Email protection for the way your business works](https://iblockspam.com/solutions): Per-domain email filtering for small businesses, MSPs, web hosts, law firms, accounting firms and real estate teams: the threats each faces and what helps.
- [Move to iBlockSpam: our guided cutover plan](https://iblockspam.com/migrate): Moving to iBlockSpam from another filter? The cutover plan we guide you through: DNS snapshot, lower TTLs, staging, MX change, checks and rollback.
- [Email filtering your clients can rely on, managed by you](https://iblockspam.com/partners): Manage every client's email filtering from one partner console. Clients approve your access; partner terms, including pricing, are agreed individually.
- [Security and data handling, in plain English](https://iblockspam.com/security): How iBlockSpam handles your email: US processing, what we store, who sees quarantined mail, encryption in transit, MFA, backups and reporting flaws.
- [Frequently asked questions](https://iblockspam.com/faq): Answers about iBlockSpam setup, compatibility, quarantine, limits, outbound relay, data handling, pricing and leaving safely, grouped by topic.
- [Get help from people who understand mail flow](https://iblockspam.com/support): Contact iBlockSpam support by email or contact form. What to include in a ticket, how we handle incidents, and how we reach you if your email is down.
- [Email protection that explains itself](https://iblockspam.com/about): iBlockSpam is a product of BroadNet. Why we built a per-domain email filtering service with honest limits, guided setup and ongoing monitoring.

## Features
- [Features (overview)](https://iblockspam.com/features)
- [Allow and block lists](https://iblockspam.com/features/allow-block-lists)
- [DMARC monitoring](https://iblockspam.com/features/dmarc-monitoring)
- [Domain monitoring](https://iblockspam.com/features/domain-monitoring)
- [Lookalike Domain Watch](https://iblockspam.com/features/lookalike-domain-watch)
- [Outage protection with mail spooling](https://iblockspam.com/features/outage-spooling)
- [Outbound relay (smart host)](https://iblockspam.com/features/outbound-relay)
- [Quarantine and digest emails](https://iblockspam.com/features/quarantine-and-digests)

## Platforms
- [Spam filtering for the mail platform you already use (overview)](https://iblockspam.com/platforms)
- [Spam filter for cPanel/WHM: MX-level filtering in front of Exim](https://iblockspam.com/platforms/cpanel-whm)
- [Spam filter for Exchange Server: an MX gateway in front of your on-premises server](https://iblockspam.com/platforms/exchange-server)
- [Spam filter for Google Workspace: an MX gateway in front of Gmail](https://iblockspam.com/platforms/google-workspace)
- [Spam filter for Microsoft 365: an MX gateway in front of Exchange Online](https://iblockspam.com/platforms/microsoft-365)

## Comparisons and alternatives
- [Compare your email filtering options (overview)](https://iblockspam.com/compare)
- [Barracuda Email Protection alternative](https://iblockspam.com/compare/barracuda-email-protection-alternative)
- [Microsoft Defender for Office 365 vs an inbound email gateway](https://iblockspam.com/compare/defender-for-office-365-vs-email-gateway)
- [Google Workspace built-in protection vs an inbound gateway](https://iblockspam.com/compare/google-workspace-built-in-vs-gateway)
- [Hornetsecurity alternative: 365 Total Protection vs a focused filter](https://iblockspam.com/compare/hornetsecurity-alternative)
- [MailChannels Inbound alternative](https://iblockspam.com/compare/mailchannels-alternative)
- [Mailprotector alternative](https://iblockspam.com/compare/mailprotector-alternative)
- [Microsoft 365 built-in filtering vs an inbound gateway](https://iblockspam.com/compare/microsoft-365-built-in-vs-gateway)
- [A Mimecast alternative for smaller teams](https://iblockspam.com/compare/mimecast-alternative)
- [MX Guarddog alternative](https://iblockspam.com/compare/mx-guarddog-alternative)
- [N-able Mail Assure alternative](https://iblockspam.com/compare/n-able-mail-assure-alternative)
- [Per-domain vs per-user pricing for email filtering](https://iblockspam.com/compare/per-domain-vs-per-user-pricing)
- [Proofpoint Essentials alternative: the facts, and your options](https://iblockspam.com/compare/proofpoint-essentials-alternative)
- [SpamExperts alternative](https://iblockspam.com/compare/spamexperts-alternative)
- [Looking for a SpamTitan alternative? An honest comparison](https://iblockspam.com/compare/spamtitan-alternative)

## Monitoring, account and partner features (live)
- [DMARC monitoring](https://iblockspam.com/features/dmarc-monitoring) (both plans): add rua=mailto:dmarc@iblockspam.com to your DMARC record; we collect the daily aggregate reports, show who sends as your domain and whether it passes SPF/DKIM/DMARC, flag likely spoofing and recommend when to move from p=none to quarantine and reject. Counts come only from receivers that send reports. Parsed reports kept 13 months. It reports; it doesn't block mail.
- [Lookalike Domain Watch](https://iblockspam.com/features/lookalike-domain-watch) (all plans): daily DNS and Certificate Transparency checks of look-alike versions of your domain (typos, character swaps, homoglyphs, other endings), with alerts when one is registered or gets a mail server. It detects; it can't take domains down.
- [Domain monitoring](https://iblockspam.com/features/domain-monitoring): MX, SPF and DMARC drift alerts, weekly on Protect, daily on Protect Plus.
- Account security: optional two-factor sign-in (authenticator app, 10 recovery codes), owners can require it for everyone, email alerts on password, sign-in email and 2FA changes, and a customer-visible activity log. See https://iblockspam.com/features#account-security
- [Partner console](https://iblockspam.com/partners) for MSPs and hosts: approved partner staff (2FA required) see every client account that granted access, with per-domain status, search, filters and CSV export. Each client pays for its own domains.
- [Free Domain Watch](https://iblockspam.com/free-monitoring) (free, no account): weekly checks of one domain's public MX, SPF, DMARC and MTA-STS records with email alerts on changes and a short monthly report. Public DNS only; not filtering.
- [Public status page](https://iblockspam.com/status): end-to-end mail-flow probe through the relay and inbound filtering, plus website, portal, tools and scheduler checks.
- [Portal demo with sample data](https://iblockspam.com/demo) and [partner console demo](https://iblockspam.com/demo/partner). [Product videos](https://iblockspam.com/videos).

## Free tools
- [All free email security tools](https://iblockspam.com/tools)
- [Email Health Check](https://iblockspam.com/tools/email-health-check): Grade your domain's MX, SPF, DKIM, DMARC and transport security in one scan.
- [MX Lookup](https://iblockspam.com/tools/mx-lookup): See where your mail is delivered, spot unfiltered backup MX and broken hosts.
- [SPF Checker](https://iblockspam.com/tools/spf-checker): Count real DNS lookups, find PermErrors, loops and risky "all" settings.
- [DMARC Checker](https://iblockspam.com/tools/dmarc-checker): Check your policy, reporting and the safe path from p=none to reject.
- [DKIM Checker](https://iblockspam.com/tools/dkim-checker): Validate DKIM keys by selector, including key type and strength.
- [Email Header Analyzer](https://iblockspam.com/tools/email-header-analyzer): Trace hops and authentication results — runs entirely in your browser.
- [SMTP Error Code Lookup](https://iblockspam.com/tools/smtp-error-codes): Paste a bounce or type a code like 550 5.7.26: plain-English meaning, likely causes and fixes, with sources.
- [Blacklist Checker](https://iblockspam.com/tools/blacklist-checker): Check an IPv4 or IPv6 address, or your mail servers, against public spam blocklists, with policy and delisting links.
- [Reverse DNS (PTR) Lookup](https://iblockspam.com/tools/ptr-lookup): Check PTR records, forward-confirmed reverse DNS and generic-looking host names.
- [MTA-STS Checker](https://iblockspam.com/tools/mta-sts-checker): Fetch and validate your MTA-STS policy, match it to your MX hosts and check TLS-RPT.
- [BIMI Checker](https://iblockspam.com/tools/bimi-checker): Check your BIMI record, logo and certificate URLs, and the DMARC policy BIMI needs.
- [SPF Record Generator](https://iblockspam.com/tools/spf-generator): Build a valid SPF record from your mail providers, with a DNS lookup count.
- [Email Deliverability Test](https://iblockspam.com/tools/deliverability-test): Send one email and see its SPF, DKIM and DMARC results, reverse DNS, blocklists, TLS and spam verdict.
- [DMARC Record Generator](https://iblockspam.com/tools/dmarc-generator): Build a DMARC record with the right policy, reporting and alignment settings.
- [DMARC Report Analyzer](https://iblockspam.com/tools/dmarc-report-analyzer): Read DMARC aggregate reports (XML, gzip or zip): see who sends as your domain and what fails — runs in your browser.
- [DKIM Key Generator](https://iblockspam.com/tools/dkim-generator): Create a DKIM key pair and the DNS TXT record for your selector — keys are generated in your browser.
- [Bulk Sender Requirements Checker](https://iblockspam.com/tools/bulk-sender-checker): Check your domain against the Gmail, Yahoo and Outlook.com bulk sender rules that DNS can show, with a checklist per provider.

## Top guides by topic
All 215 guides: https://iblockspam.com/blog

### [Email security basics](https://iblockspam.com/blog/topic/basics)
- [What is DNSSEC, and what does it do for your email?](https://iblockspam.com/blog/dnssec-explained-for-email)
- [Email encryption types for business: which do you need?](https://iblockspam.com/blog/email-encryption-types-for-business)
- [Is it safe to click unsubscribe in spam emails?](https://iblockspam.com/blog/is-it-safe-to-unsubscribe-from-spam)
- [SMTP ports 25, 587, 465 and 2525: which one should you use?](https://iblockspam.com/blog/smtp-ports-25-587-465)

### [Phishing & threats](https://iblockspam.com/blog/topic/threats)
- [How to prevent business email compromise (BEC)](https://iblockspam.com/blog/business-email-compromise-prevention)
- [AI phishing emails: what has changed and what still stops them](https://iblockspam.com/blog/ai-phishing-emails)
- [Signs your business email account has been compromised, and what to do](https://iblockspam.com/blog/signs-email-account-compromised)
- [Email bombing and subscription bombing: what it is and how to respond](https://iblockspam.com/blog/email-bombing-subscription-bombing)

### [SPF, DKIM & DMARC](https://iblockspam.com/blog/topic/authentication)
- [What is DMARC, and how does it work?](https://iblockspam.com/blog/what-is-dmarc)
- [SPF vs DKIM vs DMARC: what each one proves, and what it doesn't](https://iblockspam.com/blog/spf-vs-dkim-vs-dmarc)
- [How to stop others sending email as your domain](https://iblockspam.com/blog/stop-email-spoofing-of-your-domain)
- [Why does DMARC fail? Causes and fixes for dmarc=fail](https://iblockspam.com/blog/why-dmarc-fails)

### [Setup guides](https://iblockspam.com/blog/topic/setup)
- [How do you configure Gmail spam and phishing settings in Google Workspace?](https://iblockspam.com/blog/gmail-spam-settings-google-workspace)
- [How do you protect the domain your email depends on?](https://iblockspam.com/blog/domain-registrar-security-registry-lock)
- [How do Exchange Server's built-in anti-spam agents work, and are they enough?](https://iblockspam.com/blog/exchange-server-anti-spam-agents)
- [How do you enforce 2-Step Verification in Google Workspace without locking people out?](https://iblockspam.com/blog/google-workspace-2-step-verification-enforcement)

### [Running email day to day](https://iblockspam.com/blog/topic/operations)
- [Email deliverability checklist: how to reach the inbox in 2026](https://iblockspam.com/blog/email-deliverability-checklist)
- [Why is spam getting through the Microsoft 365 spam filter, and how do you fix it?](https://iblockspam.com/blog/microsoft-365-spam-getting-through)
- [How do you find and release quarantined email in Microsoft 365?](https://iblockspam.com/blog/release-quarantined-email-microsoft-365)
- [Why are legitimate emails going to Junk in Microsoft 365, and how do you fix it?](https://iblockspam.com/blog/microsoft-365-emails-going-to-junk)

### [Switching & migration](https://iblockspam.com/blog/topic/migration)
- [How do you decommission your old spam filter after switching?](https://iblockspam.com/blog/decommission-old-spam-filter-after-switching)
- [How does DNS TTL affect an MX record change?](https://iblockspam.com/blog/dns-ttl-mx-change-propagation)
- [Exchange Server 2016 and 2019 end of support: what are your options?](https://iblockspam.com/blog/exchange-server-end-of-support-email-options)
- [How to change MX records without losing email](https://iblockspam.com/blog/change-mx-records-without-losing-email)

### [Choosing a filter](https://iblockspam.com/blog/topic/buying)
- [Email security RFP template: 25 questions to ask before you buy](https://iblockspam.com/blog/email-security-rfp-template)
- [How should an MSP price managed spam filtering?](https://iblockspam.com/blog/msp-spam-filter-pricing-margin-guide)
- [Defender for Office 365 Plan 1 vs Plan 2: which do you need?](https://iblockspam.com/blog/defender-for-office-365-plan-1-vs-plan-2)
- [How much does email security cost a small business?](https://iblockspam.com/blog/email-security-cost-small-business)

## Reference
- [SMTP error codes: meaning and fixes, one page per code](https://iblockspam.com/tools/smtp-error-codes)
- [SPF records by email provider](https://iblockspam.com/spf)
- [DKIM records by email provider](https://iblockspam.com/dkim)
- [Email security glossary](https://iblockspam.com/glossary)
- [Email security of the top 1,000 websites (2026 DNS study, CC BY 4.0)](https://iblockspam.com/research/email-security-top-1000)

## Markdown copies
- [Pricing](https://iblockspam.com/pricing.md)
- [How it works](https://iblockspam.com/how-it-works.md)
- [FAQ](https://iblockspam.com/faq.md)
- [Features](https://iblockspam.com/features.md)
- Any guide, tool, feature, platform, comparison, SPF, DKIM or SMTP error page: add ".md" to its URL, e.g. https://iblockspam.com/blog/what-is-dmarc.md

## Optional
- [Full text of the product, pricing, comparison and research pages, plus the glossary and tool list, split into files of about 100 KB (index of the files)](https://iblockspam.com/llms-full.txt)
- [Full text of all 215 guides, split by topic into files of about 100 KB (index of the files)](https://iblockspam.com/llms-guides.txt)
- [Full text of every SMTP error code page and the SPF and DKIM records by provider pages, split into files of about 100 KB (index of the files)](https://iblockspam.com/llms-reference.txt)