---
title: K-9 Mail Reviews
meta_title: 'K-9 Mail Reviews 2026: Details, Pricing, & Features | G2'
meta_description: Filter 13 reviews by the users' company size, role or industry to
  find out how K-9 Mail works for a business like yours.
aggregate_rating:
  rating_value: 4.5
  review_count: 13
  scale: '5'
date_modified: '2026-08-04'
parent_category:
  name: Collaboration & Productivity
  url: https://www.g2.com/categories/collaboration-productivity
---

# K-9 Mail Reviews
**Vendor:** Opensource  
**Category:** [Email Client Software](https://www.g2.com/categories/email-client)  
**Average Rating:** 4.5/5.0  
**Total Reviews:** 13
## About K-9 Mail
K-9 is an opensource email client based on the Email application shipped with the initial release of Android. K-9 is focused on making it easy to chew through large volumes of email.





## K-9 Mail Discussions
  - [What is K-9 Mail used for?](https://www.g2.com/discussions/what-is-k-9-mail-used-for)

- [View K-9 Mail pricing details and edition comparison](https://www.g2.com/products/k-9-mail/reviews?page=2&section=pricing&secure%5Bexpires_at%5D=2026-08-04+12%3A23%3A45+-0500&secure%5Bsession_id%5D=7e13f9e8-67f4-4f5a-a102-b791873309cc&secure%5Btoken%5D=f48b4f4dd9f1d5b0ed67e1f8993dbfe5c1d2f3014202d0a0473e4139976b978a&format=llm_user)

## K-9 Mail Features
**Inbox Tools**
- Unified Inbox
- Filters
- Reminders
- Notifications

**Coordination Tools**
- Calendar
- Contacts
- Task Management

**Software Options**
- Desktop Application
- Mobile Application

**Email Client - Agentic AI**
- Autonomous Task Execution
- Cross-system Integration

## Top K-9 Mail Alternatives
  - [Microsoft Outlook](https://www.g2.com/products/microsoft-outlook/reviews) - 4.5/5.0 (3,430 reviews)
  - [Thunderbird](https://www.g2.com/products/thunderbird/reviews) - 4.3/5.0 (334 reviews)
  - [BlueMail](https://www.g2.com/products/bluemail/reviews) - 4.3/5.0 (48 reviews)