# Opt-Inbox Software Pricing, Alternatives & More 2026 | Capterra > With the help of Capterra, learn about Opt-Inbox Software - reviews, pricing plans, popular comparisons to other Email Management products and more. Source: https://www.capterra.com/compare/142862-145793-127167-124708/hubspot-crm-vs-salesforce-sales-cloud-vs-microsoft-dynamics-365-vs-zoho-crm --- # Opt-Inbox Software Review 2026: Features, Reviews, Integrations, Pros & Cons Last updated on March 13, 2026 Provider data verified by our Software Research team, and reviews moderated by our Reviews Verification team. [Description](#description)[Use cases](#use-cases)[Alternatives](#alternatives)[Features](#features)[Pricing](#pricing)[Support](#support)[Reviews](#reviews) Opt-Inbox ## What is Opt-Inbox? Sendio's Opt-Inbox verification process distinguishes humans from automated senders, ensuring Sendio users receive only the email they want. It is a proprietary challenge-response mechanism that ensures you only receive the mail you want. Your time is important, and its time you got an email solution that makes sure time is spent on the projects that matter, not on junk mail. ## What is Opt-Inbox used for? [Email Management](https://www.capterra.com/email-management-software/) Overall rating Based on 3 user reviews Reviews sentiment Positive \- Neutral \- Negative \- Starting price $795 Per User, Per Year Free trial available Capterra Shortlist charts the highest-rated and most popular products... Our "Best of" badge program showcases products with the highest ratings... Our "Best of" badge program showcases products with the highest ratings... Do you work for Opt-Inbox?[Manage this product listing](https://digitalmarkets.gartner.com/get-listed/claim-bx?url=http://www.sendio.com&name=Opt-Inbox) ## Compare with a popular alternative Capterra selects software alternatives based on relevant features, verified user reviews and user interactions. Placement may be influenced by client status. ### Opt-Inbox 4.0 (3) VS. [### Gaggle Mail](https://www.capterra.com/p/159732/Gaggle-Mail/) [4.6 (36)](https://www.capterra.com/p/159732/Gaggle-Mail/reviews/) Starting Price $795 Per User, Per Year Starting Price $2.5 Per User, Per Month Free Trial Free Version Pricing Options Free Trial Free Version Ease Of Use 3.7 (3) Ease Of Use 4.6 (36) Value For Money 4.0 (1) Value For Money 4.4 (32) Customer Service 3.0 (2) Customer Service 4.5 (25) ## Opt-Inbox alternatives Highest Rated [MailReach](https://www.capterra.com/p/230805/MailReach/) [5.0 (24)](https://www.capterra.com/p/230805/MailReach/reviews/) Starting price $19.50 Per User, Per Month Pricing Options Free Trial Free Version User Rating 100% of reviewers rated it above 4 stars [Learn More](https://www.capterra.com/p/230805/MailReach/) [Outlook Export](https://www.capterra.com/p/155033/Outlook-Export/) [5.0 (5)](https://www.capterra.com/p/155033/Outlook-Export/#reviews) Starting price $29.00 Per User, Per Month Pricing Options Free Trial Free Version User Rating 100% of reviewers rated it above 4 stars [Learn More](https://www.capterra.com/p/155033/Outlook-Export/) [MailBoxValidator](https://www.capterra.com/p/152461/MailBoxValidator/) [4.5 (52)](https://www.capterra.com/p/152461/MailBoxValidator/reviews/) Starting price $19.95 Per User, Per Month Pricing Options Free Trial Free Version User Rating 98% of reviewers rated it above 4 stars [Learn More](https://www.capterra.com/p/152461/MailBoxValidator/) [Unroll.me](https://www.capterra.com/p/230199/Unrollme/) [4.2 (18)](https://www.capterra.com/p/230199/Unrollme/reviews/) Starting price Contact vendor for pricing Pricing Options Free Trial Free Version User Rating 83% of reviewers rated it above 4 stars [Learn More](https://www.capterra.com/p/230199/Unrollme/) ## Features Features with the highest number of reviews are displayed first. Those that have no reviews appear next, sorted alphabetically. Archiving & Retention Moving and separately storing data that is not actively used or continuous storage of data for compliance purposes Data Recovery Ability to restore deleted, hidden, or lost data from an email server/system Queue Management Monitor wait time and abandonment for incoming requests that have not been routed Routing Plan daily routes to optimize employee scheduling and provide directions Spam Blocker Filters used to determine different types of malware threats Whitelisting/Blacklisting Control system access and/or deliverability for applications and email addresses Opt-Inbox 6 features Moving and separately storing data that is not actively used or continuous storage of data for compliance purposes Ability to restore deleted, hidden, or lost data from an email server/system Monitor wait time and abandonment for incoming requests that have not been routed Plan daily routes to optimize employee scheduling and provide directions Filters used to determine different types of malware threats Control system access and/or deliverability for applications and email addresses Features 3.0 (2) 3.0 Based on 2 reviews ## Pricing Value for money 4.0 (1) Free Trial Basic $795.00 Per User,Per Year Value for money 4.0 (1) 4.0 Based on 1 reviews ## Support, customer service and training options Customer Service 3.0 (2) Support - Email/Help Desk - FAQs/Forum - Knowledge Base - Phone Support - 24/7 (Live rep) - Chat Training - In Person - Live Online - Webinars - Documentation - Videos Deployment - Web - Android - iPhone/iPad Typical users - Freelancers - Small businesses - Mid size businesses - Enterprises Customer Service 3.0 (2) 3.0 Based on 2 reviews ## User reviews Overall rating 4.0 Based on 3 reviews Filter by rating 5(1) 4(1) 3(1) 2(0) 1(0) Mentioned topic Sorted by most recent AU Anonymous User Web Strategist & e-Commerce Manager Automotive ### "Seems Excessive" 4.0 Overall Rating 4.0 4.0 Ease of Use 3.0 3.0 Features 3.0 3.0 Customer Service 0.0 0.0 Likelihood to Recommend 5/10 March 5, 2019 Pros Sendio blocks spam and requires senders to confirm their email address before automatically bypassing the Sendio filters. Cons Sendio blocks spam and a whole lot of other emails. While this might be nice at first, I quickly realized that emails were getting stuck in Sendio for days or weeks at a time because the email sometimes doesn't get passed along in the daily report. This makes for some crabby vendors or missed opportunity because emails get "lost" Review source Non-incentivized review: any software user can leave a review for any product listed on our site. All submitted reviews are subject to our verification process prior to publication. Jordan D. IT Manager Consumer Goods ### "Dated and need of a refresh" 3.0 Overall Rating 3.0 3.0 Ease of Use 3.0 3.0 Features 3.0 3.0 Customer Service 1.0 1.0 Likelihood to Recommend 5/10 October 8, 2018 When my company started using Sendio 5 years ago, Sendio was all about staying a head of the competition. They would setup user meeting to discuss the product and ask for input on how to improve. Sendio 5 years ago was awesome, with an amazing support team. That didn't last long though. Sendio 2015 forward is stagnant. It has been over a year since I have seen a product update, over 2 years since I have seen new features added. 2 years ago I asked what their plans were for moving past flash, response was within a year they would have a new UI. We are still on a flash based user interface, and it only causes issues with browsers that disable flash by default. The responses I get from support for any kind of bug or feature issues are not promising either. If it wasn't for the unparalleled control and Spam filtering that Sendio gives us, we would have moved away from the product a while ago. The main feature of Sendio, opt-in mailbox, works extremely well. As long as you have employees that understand how it functions, Sendio is awesome, UI and Support aside. Pros Opt-in mail that results in a high spam catch rate easy to manage whitelist, blacklist, or hold lists hosted decent pricing Cons uses flash for its UX customer service and development is lacking Review source Incentivized review: software users are invited to submit an honest review and offered a nominal incentive for their time and effort. All incentivized reviews are subject to our verification process prior to publication. WL Will L. Owner ### "Amazing program that removes all spam and unrelated email from my inbox. " 5.0 Overall Rating 5.0 5.0 Ease of Use 5.0 5.0 Features 0.0 0.0 Customer Service 5.0 5.0 Likelihood to Recommend 0/10 May 13, 2015 I get one email every morning with the spam email captured by Sendio from the day and night before. My secretary goes through that each morning and I am freed up from wasting time every day deleting email that is unrelated to my business. Thank you, Sendio. 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