K9 is by far the best email client I've found for Android. I'm glad for its open-source nature as it helps to be secure in the knowledge that my email is not being listened-in-on, as well as other more advanced features such as E2EE via PGP encryption. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

K9 color schemes can affect the readability of email. For example, if you set emails to be read on a dark background, some text may also be set to a dark color and not be changed by K9. It would be nice if K9 could change the text color so it had more contrast no matter what the email specified. Review collected by and hosted on G2.com.

Encio B.

Analista mayor de servicios tecnicos de Licencias de Gas

Enterprise (> 1000 emp.)

11/14/2018

"Excellent option to management of POP3 and IMAP."

5/5

What do you like best about K-9 Mail?

It's simple to use and it has a lot of options to configure your emails. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

User interface should be a little more modern or clean. Review collected by and hosted on G2.com.

Verified User in Design

Small-Business (50 or fewer emp.)

1/4/2018

"Mail client."

4/5

What do you like best about K-9 Mail?

One of the few email clients POP and IMAP, for Androida. In my opinion, the most adequate. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

Not very convenient to use. The interface is more convenient for the program Agua Mile. I would like the developer to listen to the wishes of users. Review collected by and hosted on G2.com.

Verified User in Events Services

Small-Business (50 or fewer emp.)

1/4/2018

"Highly recommended "

4/5

What do you like best about K-9 Mail?

Ease of use and the ability to merge all emails in one place Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

There is nothing wrong with the application Review collected by and hosted on G2.com.

Verified User in Biotechnology

Mid-Market (51-1000 emp.)

1/24/2017

"K9 mail: The best android mail client"

5/5

What do you like best about K-9 Mail?

K9mail handles multiple accounts easily, notifications are trivial to set up, and of course the entire app is open source. It is updated fairly frequently- every month or two, usually. There are no major features which are absent, and it can be used with any mail server which supports IMAP or POP. It has built-in support for PGP encryption as well, using an app like OpenKeychain. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

The search function of the app could definitely use some work- if there were a way to more easily search the remote server for old emails, that would be useful. But this can be worked around by starring emails I think I'll need later for ease of search. Review collected by and hosted on G2.com.

Recommendations to others considering K-9 Mail:

K9mail is a phenomenal free and open-source email client for mobile devices. Certainly more featureful than most default email clients, I highly recommend this to anyone who cares about freedom when choosing which apps they want to run on their device. It's stable, it works well, and you will have few complaints. Review collected by and hosted on G2.com.

What problems is K-9 Mail solving and how is that benefiting you?

This makes it easy to keep in touch with my job and receive emails from my phone when I'm on the move. Review collected by and hosted on G2.com.

Greg K.

Technical Support & Software Trainer

Translation and Localization

Small-Business (50 or fewer emp.)

7/27/2016

"Solid app for Exchange email"

4.5/5

What do you like best about K-9 Mail?

The layout is clean and simple to use. It allows me to keep up to date with my work emails while on the go. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

I don't seem to be able to import all of my folders. I have sub-folders within my Inbox, but they don't appear on the app (while other exchange apps will show everything). Review collected by and hosted on G2.com.

Recommendations to others considering K-9 Mail:

It's a great app for POP3, IMAP, and Exchange email accounts. It's great for basic use, but if you use it for a work account that has a lot of sub-folders, it may not work for you. Review collected by and hosted on G2.com.

What problems is K-9 Mail solving and how is that benefiting you?

Keeping up to date with work emails while away from my computer. Review collected by and hosted on G2.com.

Chris M.

Camera, Grip, and Lighting Departments

Entertainment

Mid-Market (51-1000 emp.)

4/1/2016

"Simple E-Mail App that Works"

4/5

What do you like best about K-9 Mail?

I first downloaded K-9 Mail when my Android's pre-installed e-mail client wouldn't work, and have been using it for everything except my personal G-mail ever since. The app is simple with very little in the way of frills, and it just works. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

The biggest annoyance is trying to search for e-mails that have since been deleted locally. Currently, only e-mails that are on the device are searchable, so if you want to search beyond the 50 or so still stored locally, you have to download past e-mails, 50 at a time, which then show up as unread. If there was a way for the app to search the server and only download e-mails matching the search criteria, the search function would be much more useful. Review collected by and hosted on G2.com.

Recommendations to others considering K-9 Mail:

If you're looking for something with a lot of features, look elsewhere. If you want an app that is simple and just works, then this is it Review collected by and hosted on G2.com.

What problems is K-9 Mail solving and how is that benefiting you?

K-9 lets you combine multiple e-mail accounts into one, easy to use, highly intuitive client, and just works when others don't Review collected by and hosted on G2.com.

Verified User in Individual & Family Services

Mid-Market (51-1000 emp.)

10/15/2016

"Great for free but has some rough edges"

4.5/5

What do you like best about K-9 Mail?

Free, supports multiple inboxes and IMAP and POP3 Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

Old look and feel (GUI), need to manually purge and compact mailboxes Review collected by and hosted on G2.com.

Verified User in Health, Wellness and Fitness

Enterprise (> 1000 emp.)

1/5/2016

"K9 mail review"

4/5

What do you like best about K-9 Mail?

It was fast and accurate. It felt as if it retrieved my mail before my phone would. Review collected by and hosted on G2.com.

What do you dislike about K-9 Mail?

There was some issues like compatibility using it with a galaxy note 4. It did not like cooperating on my phone with my other programs. Felt like I was constantly getting doubles of emails and when I tried to delete it on K9 it wouldn't transfer over to my mailbox on other devices. Review collected by and hosted on G2.com.

Recommendations to others considering K-9 Mail:

Use their support it helped majorly with the doubling of mail issues but I still feel as though it didn't play very nice with the Android OS. Review collected by and hosted on G2.com.

What problems is K-9 Mail solving and how is that benefiting you?

We wanted a mail client that worked efficiently both by way of the desktop and on different smartphones as apps. I realized that we needed something that we could go to and did not have to look in multiple places for. A one place for all mail but better than the standard client on phones. Review collected by and hosted on G2.com.