4 / 5
3 reviews

Who Uses This Software?

Sendio markets its products worldwide in partnership with resellers and systems integrators that focus on email solutions.

Average Ratings

3 Reviews

  • 4 / 5

  • 3.5 / 5
    Ease of Use

  • 3 / 5
    Customer Service

Product Details

  • Starting Price
  • Pricing Details
    25 Users
  • Free Trial
  • Deployment
    Cloud, SaaS, Web
  • Training
    Live Online
  • Support
    24/7 (Live Rep)

Vendor Details

  • Sendio
  • Founded 2003
  • United States

About Opt-Inbox

Sendios Opt-Inbox verification process distinguishes humans from automated senders, ensuring Sendio users receive only the email they want. Its 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.

Opt-Inbox Features

  • Data Recovery
  • Email Archiving
  • Email Monitoring
  • Queue Manager
  • Response Management
  • Routing
  • Shared Inboxes
  • Signature Management
  • Spam Blocker
  • Whitelisting / Blacklisting

Opt-Inbox Reviews Recently Reviewed!

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Dated and need of a refresh

Oct 08, 2018

3 / 5
Ease of Use

3 / 5
Features & Functionality

1 / 5
Customer Support

4 / 5
Value for Money
Likelihood to Recommend: 5.0/10 Not

Pros: Opt-in mail that results in a high spam catch rate

easy to manage whitelist, blacklist, or hold lists


decent pricing

Cons: uses flash for its UX

customer service and development is lacking

Overall: 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.

Seems Excessive

Mar 05, 2019

3 / 5
Ease of Use

3 / 5
Features & Functionality
Likelihood to Recommend: 5.0/10 Not

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"

Amazing program that removes all spam and unrelated email from my inbox.

May 13, 2015

5 / 5
Ease of Use

5 / 5
Customer Support

Comments: 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.