Looks like obsolete request since BlackBerry is not supporting OS anymore (https://www.blackberry.com/us/en/support/devices/end-of-life)

As Dave suggested, I've filed the email problem as a separate issue: JRA-41369.

FWIW the viewport tag causing the email problem (discussed by Brendan, Richard and Datta) seems to come from atlassian-jira/WEB-INF/classes/templates/email/html/includes/header.vm:11:

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0"/>

Commenting or removing this line (and restarting Jira) results in emails displaying nicely on my BlackBerry Bold 9900. (They had previously been blank, as the others have described.)

Datta, I recommend opening a new ticket, and including the OS version of your BlackBerry - it's BlackBerry 10, but what version?

HTML emails look fine on my Q10, running 10.3.1.

This is fixed in a minute if only a developer would take a look. :-/

As already mentioned, just add the browser user agent to be recognized for the mobile site.

BlackBerry 10 has it's own user agent which you could easily add to be detected.

Please reference this BlackBerry material for how to detect the BlackBerry 10 browser for mobile:

http://devblog.blackberry.com/2012/08/blackberry-10-user-agent-string/

The email browser for blackberry, unlike the web browser, doesn't support the viewport tag. The way to make emails render both on blackberry and on outlook is to remove the viewport element from the meta element in the email header.

Tested in crucible (which had the same problem), waiting for a safe time to restart jira to re-test on JIRA.

http://www.emailonacid.com/blog/details/C13/emailology_viewport_metatag_rendered_unusable

Looks like this needs to be forked - the email issue is likely different from the JIRA mobile one.

Getting tons of emails, only slightly readable if you say "Get Plain Text".

JIRA is mostly used at enterprises, so is Blackberry. We use both as well. I find it important to support BB as a mobile device. Please implement it.

As an enterprise customer we need this feature. All our employees have BlackBerrys.

I'd be happy to beta test this feature!

Please also provide email support for other Blackberry devices. Since JIRA 6.1, emails received on a Blackberry Curve are not readable with HTML. The mail displays as blank.

By supporting the Z10, make sure you're supporting the BlackBerry 10 browser in general.

I'm a BlackBerry Q10 user myself

Hello,
In addition to the above points - please support the Blackberry browser.
There was this project http://home.pocketjira.com ... I would buy it immediately but it does not support the newer versions of JIRA.
As for the business requirement: As a release manager I am spending much time running through the building while different teams work on issues and problems. I need to be able to transition tickets while I am on the go. Unfortunately, Iphones, Androides and the kind are not allowed in the company network for standardization and security reasons.
Cheers & best,
Andreas