Opt-Inbox Alternatives (September 2025)

Protect your enterprise with best in breed email security from Sendio. Eliminate ransomware, phishing attacks, spam and malware using behavioral technology.

A suite of email marketing tools to monitor Inbox placement, Deliverability, IP health and Sender Reputation, compatible with all Email Service Providers.

Forget searching through junk, spam, and unsolicited emails to find what you actually need. Bulletproof turns your open-access inbox into a permission-based one.

Material is a multi-layered detection and response toolkit for email. It stops sophisticated email-based attacks and contains the blast radius of compromised accounts.

Mesh is the world's first email security platform built exclusively for MSPs, enhancing their efficiency and ensuring greater safety for their customers. Offering flexible deployment options - Mesh Gateway (MX based), Mesh 365 (API based), and Mesh Unified (MX and API based) - Mesh protects organiza

Spambrella is your company for managed email security services and User Awareness Training solutions and products. Try our security services for email today!

INKY helps companies secure email using a cloud-based security platform that proactively and instantly scans inbound, internal, and outbound emails to eliminate phishing and malware. The platform intelligently eliminates security threats by blocking malicious emails while assisting employees in real time to handle suspicious emails.

Stop advanced email threats and optimize security operations with AI-powered email security that adapts to your organization. Available for on-premise and Microsoft 365.

The only deliverability tool you need. Find out why your email is going to spam and protect your sender reputation

Fortinet's Email Security Solutions provides protection for your critical business information. Learn how to send Secure Email Gateways (SEG) with FortiMail.

Your smart DMARC reporting and monitoring platform. Ensure domain-level security and email deliverability with EasyDMARC’s DMARC, SPF, DKIM, and BIMI services.

EmailConsul offers comprehensive email deliverability solutions, including DMARC monitoring, spam traps detection, seedlisting and inbox placement tests, Google Postmaster integration, SNDS integration, IP and domain blocklist monitoring, lookalike detection, and logs monitoring.

Cloud Email Protection, the integrated cloud email security solution from Fortra, stops advanced threats that bypass security defenses and make it into inboxes.

Email deliverability software guaranteed to boost email placement. InboxAlly’s real-time tracking and email warmup ensure your messages hit the inbox, not spam.

N-able Mail Assure offers MSPs AI-driven email security with close to 100% filtering accuracy. Mail Assure also provides continuous uptime and email archiving.

Award-winning cloud-based email security platform prevents phishing, malware, spoofing, and BEC, from reaching a user’s mailbox. See the Trustifi Difference.

Cisco Secure Email Encryption Service gives senders enhanced security and reliable controls for traditional email tools.

GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.

Batch your emails into manageable daily, weekly, or monthly digests.

Secure your business emails. Train your employees to cyber attacks. Protect your emails with Mailinblack.

Track and optimize email deliverability - from inboxing and open rates to blocklist monitoring, engagement levels and growth rate.

Secure your business with total messaging control. Cybonet stops the majority of malicious email threats at your network's perimeter while simultaneously providing a range of additional options for comprehensive security and messaging control.

An essential suite of email and web security services for SMB and Enterprise.

Mailbutler is the email software extension plugin for Apple Mail, Gmail, and Outlook that helps you stay productive and professional.

InMoat puts you back in control of your inbox. Tailor your inbox with readymade email filters, designed by experts, and let your inbox work for you. Win back time, maintain focus, and be more productive.

SMX offers a cloud-based email security solution for SEG, archiving and added Microsoft 365 defence. Trusted by enterprises, governments and ISPs across ANZ.

Allegrow is the No. 1 inbox placement tool that ensures deliverability and keeps your outreach emails from landing in spam.

Achieve and maintain DMARC enforcement 4x faster than any other platform with Valimail’s best-in-class email authentication solutions.

Protect your customers with artificial intelligence with real-time spear phishing protection and cyber fraud defense to prevent personalized attacks.

Cut your team's email management time in half & get started on the road to a cleaner inbox and more productive day with SaneBox. Start your free trial now!

Mailprotector has the complete email security products your users need to cover all three comprehensive pillars: email security, encryption, and privacy.

DMARC is the leading email authentication protocol. Understand how DMARC authentication blocks spoofed emails and phishing attempts & keeping your inbox safe.

Mailtrim provides secure Free email client software with its unique team collaboration Feature and is designed to serve the mailing needs of all business

Email security and spam filtering with SpamTitan from TitanHQ uses double AV and AI driven malicious URL detection to block malicious threats

Take back control of your email reputation with award-winning, cloud-based DMARC, DKIM and SPF configuration and management.

VIPRE provides email security solutions for every size organization and the IT partners that serve them.

MailChannels ensures your customers' emails are always delivered. Trusted by the fastest-growing hosting providers.

MX Layer provides cutting-edge cloud-based solutions for email security, business continuity, data loss prevention, and email archiving services.

Exceptional Email Security, Email Archiving and Phishing Awareness. Libraesva stops Zero-Day Email Attacks, integrating with M365 and Google

Secure E-Mail Boolebox: to send and receive encrypted messages and attachments using the advanced security features of Boolebox. Learn more!

Krijg weer volledig zeggenschap over uw maildomein! Kevlarr beschermt uw online merk en identiteit tegen phishing, CEO fraude, impersonatie en andere online gevaren.

Symantec Messaging Gateway protects email against spam, malware, targeted attacks and provides advanced content filtering, data loss prevention, and email encryption.

MailGuard is a leading Australian technological innovator, providing complete enterprise-grade protection against email security threats such as phishing, ransomware, and BEC. First to stop fast breaking attacks, MailGuard detects and prevents email threats 2-48 hours ahead of the market.

We’re powering the next generation of secure email communications for your organization, preventing data leaks & empowering people to work securely.

Email Security, Archiving, Encryption, & Awareness Training. Compatible with Office 365. Virus, Phishing, Ransomware & Malware Protection.

How it works: Avanan adds an invisible layer of full-suite security for cloud email/collaboration, like Office 365, to create universal threat management.

Prevent sensitive emails from being sent to the wrong person. Confirm external recipients and attachments with this convenient Outlook add-in.

Protect your business e-mail from cyberattacks: phishing, ransomware, spam, viruses. Installation in just a few clicks. French solution 🇫🇷

Guardian Digital has developed unparalleled AI-powered business cloud email security services. Secure your business emails and stay threat-ready today.

Enhance VIPRE Email Security Cloud with unparalleled protection against malicious links and infected attachments.

Mimecast brand protection services combine machine learning and targeted scans to identify potential attacks reduce compromise. Learn more.

Ensure deliverability and inbox placement for your transactional emails with Oracle Cloud Infrastructure Email Delivery, based on Dyn's Email Delivery technology.

Intelligent Email Security protects against data breaches by engaging and empowering users without introducing friction.

The award-winning Clearswift Secure Email Gateway offers an unprecedented level of email security, including cyberattack protection and data loss prevention.

The best email deliverability tool to raise your reputation and stop landing in spam. Reach the inbox and get better email results with MailReach.

Streamline your SPF record management, enable DMARC compliance, and improve your email deliverability by fixing the SPF 10 record limitation.

Mimecast DMARC Analyzer provides full visibility into all email senders using your domain. Use our DMARC Analyzer to identify legitimate vs fraudulent senders.

Archive, manage, and secure your organization's email with archiving software designed specifically for Exchange.

Phishing protection including spam filtering, outbound SMTP with DKIM, backup MX services, and Advanced Threat Protection. With 24x7 support included.

MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.

Discover Alinto, email solutions for organisations and service providers. ensure the deliverability, management and the security of your emails.

Cloudmark is a trusted leader in intelligent threat protection against known and future attacks, safeguarding 12 percent of the world’s inboxes from wide-scale and targeted email threats.

Full suite for Microsoft 365 security, Risk, Governance, Compliance & Backup

Barracuda Essentials for email security provides IT service providers with complete email security, archiving, e-discovery and backup solution.

Email API and SMTP relay to not just send and measure email sending, but also alert and optimise. We provide you with tools, expertise and support needed to reliably deliver emails to your customers inboxes on time, every time.

Boxward email warmup tool will keep your emails out of the spam and junk folders and ensure you reach the inbox

Free Email Tracking Trial lets you track email, recall email and modify sent email. You get Free, unlimited Read Receipts and Confirmations when email gets read. Find out When, Where for How Long recipients read your sent emails

Trend ScanMail™ for Domino provides comprehensive mail server security with real-time protection and streamlined administration that blocks emails with links to malicious sites.

Over 90% of targeted ransomware attacks start with a spear phishing attack. But with a single appliance, you can detect and block targeted attacks.

Verify your email list in minutes, or integrate real-time email verification into your app with our API. Over 18 billion emails verified. Get started for free.

Skysnag is the most autonomous DMARC solution. Protect your domain with Skysnag's self serve & managed services.

Secure your business with total messaging control. Cybonet stops the majority of malicious email threats at your network's perimeter while simultaneously providing a range of additional options for comprehensive security and messaging control.

MagicMail is the top selling, carrier-grade email server built for ISPs, Telcos, and Cable companies to manage your back-end services for email.

Empower your brand with centralized email compliance management. Maximize revenue through compliant outbound marketing.

Kaspersky Security for Microsoft Office 365 protects your cloud-oriented enterprise from email-borne threats. Learn how it uses advanced next generation techniques to stop phishing, ransomware, malicious attachments, spam and business email compromise (BEC).

Cost-effective, secure hosted email: mailboxes, calendar and address book

Run your email campaigns with the best email warm up tool provided by inboxigniter & keep emails away from spam folder. Register today!

Email security is critical for all organizations. Block all email attacks using Mimecast's advanced email security product with targeted threat protection.

A pioneering email deliverability services company that's been helping top brands solve their toughest email delivery problems, since 1999.

Drag directly from Outlook client and O365 to anywhere with DragDrop. Dragging emails & attachments is easy with DragDrop. Easy, Fast & Secure

Real-time link click protection defends against malicious links in emails every time, on every device, from anywhere.

More than 250,000 professionals use Right Inbox every day to increase their email productivity. 12 powerful features to supercharge your Gmail account.

Mail Manager is an email management add-in for Outlook designed to help project and client-based businesses get control of their email. Find out more.

IRONSCALES’ cloud email security software is an AI-powered email platform for enterprise organizations. Our self-learning service protects against advanced email attacks that bypass traditional defenses.

Clean and organize your messy mailbox with a bulk email cleaner app - Clean Email. Choose your email provider to start cleaning.

Webbula offers email hygiene, email verification, and data appends solutions to help you clean and grow your email database.

Improve the deliverability of your cold email campaigns with our network of inboxes interacting with each other.

EmailFlow Outlook add-in helps you simplify and expedite your email reviewing process for all your professional emails directly from Outlook.

Shared inbox for a transparent workspace—Zoho TeamInbox lets you manage team emails efficiently, gives you clutter free inboxes and helps attain Inbox Zero easily.

Unlock deeper deliverability insights, more efficiency and supercharged performance with the complete email package. Our email signals platform provides visual renderings and deep insights on your program's performance, paired with a best-in-class professional services team. So you can land every send.

Your new productivity Hub

N-able SpamExperts offers professional anti-spam email filtering and archiving for Web hosting providers, Internet Service Providers and Telcos.

Inbox Tracker uses email tracking to monitor your programs and competitors’ deliverability through key metrics: inbox placement, subscriber rates, and more!

Scrubby is the only complete email validation tool that goes beyond standard SMTP validation, uniquely incorporating risky and catch-all email checks to provide complete validation, ensuring an impressive 98% deliverability for your entire list.

Enterprise-strength tool for automating both mass-mailing and single email processing jobs.

Everything you need for more successful email delivery and performance management, from simple sending tools to deeply informative reporting.

Graphus is automated email security software, providing security for Google Workspace & Microsoft 365 users against phishing & social engineering attacks.

Email on Acid is the leading email pre-deployment checklist and a configurable part of your email marketing workflow, from accessibility checks to email previews.

Improve domain reputation and increase the quality of your mailing list by validating emails before sending a campaign, or at the point of capture.