April 2026 — Thunderbird Support Dashboard

Full report on GitHub →

April 2026 report · generated 2026-05-19

Donor Care

500 tickets · Zendesk
Note: April was an appeals month — donor outreach drove the volume spike and shapes the comparisons throughout this report.
Donor CSAT
77.0%
+8.0 pts MoM
Donor Tickets
500
+103.3% MoM
Total Tickets
516
+93.3% MoM

TB Pro

16 tickets · Zendesk
TB Pro CSAT
62.5%*
TB Pro Tickets
16
-23.8% MoM

*3 ratings only — not statistically significant. One dissatisfied rating from a contributor checkout error.

New Ideas — April (6 total)

IdeaVotesTag
Domain Hosting Support for Thundermail13Thundermail
Dark Mode4Accounts & Subscriptions
Promote Thunderbird4Thundermail
Demo Account for "trial" before buying3Accounts & Subscriptions
Offer HIPAA BAA (Business Associate Agreement)2Appointment
EU Based Thunderbird Pro1Thunderbird Pro

Top Ideas All-Time

IdeaVotesTag
Unlimited aliases21 (+15 this month)Thundermail
Domain Hosting Support for Thundermail13Thundermail
Server Side Email Filtering12 (+9 this month)Thundermail
Sign-in with Thunderbird12 (+4 this month)Accounts & Subscriptions
À la carte pricing5 (+4 this month)Accounts & Subscriptions

Android

Play Store reviews · SUMO Android forum · K-9 Mail Discourse · April 2026

Play Store Reviews#

596 reviews · TB 495 · K-9 101 · 29 languages
⚠️ Play Store Rating — Q2 Trend

TB: 3.81★ this month (-0.06 from March). Track against 4★ annual goal.

TB Avg Rating
3.81★
-0.06 from March
K-9 Avg Rating
2.96★
-0.56 from March
1–3★ Replies
205
Down from 215

Star Distribution — TB (495 reviews)

Star Distribution — K-9 (101 reviews)

Friction Points  — click a theme to see the full story in the report

Theme Mentions Neg. mentions
1–3★ reviews
Avg ★TBK-9 Neg. mentions trend
rolling 3 months
Push / Notification Sync 52 37 2.73★ 42 10 23 → 31 → 37 📈
Spam Filter Absent 23 12 3.09★ 21 2 0 → 10 → 12 📈
Crashes & Freezes 11 9 2.00★ 9 2 0 → 6 → 9 📈
Calendar Missing 8 5 2.88★ 7 1 0 → 6 → 5 📉
Stuck Outbox / Send Failure 2 1 4.00★ 1 1 0 → 4 → 1 📉
QR / Settings Import 3 1 3.67★ 3 0 0 → 4 → 1 📉
Email Headers / Print 4 2 3.00★ 4 0 0 → 2 → 2 ➡️

Top 10 Languages — Play Store

LanguageReviews
English181
German142
Spanish44
French40
Japanese36
Russian35
Italian25
Portuguese14
Polish13
Dutch12

Definitions

MentionsCount of Play Store reviews whose text matches a topic's keyword pattern, regardless of star rating. One review = one mention even if multiple keywords match.
Neg. mentionsMentions where the review is 1–3 stars. This is a count of reviews, not a count of star ratings.
Avg ★Mean star rating (1–5) across all reviews matching that topic — both positive and negative.
Neg. mentions trendCount of negative mentions (1–3★) for that topic over the rolling 3-month window.

Android Forum#

SUMO · thunderbird-android · April 2026
Questions
73
+7 MoM
Solved Rate
65%
-7 pts MoM
Ignored %
22%
-2 pts MoM
MetricValueMoM3-mo trend
Questions (excl. spam)73+760 → 66 → 73
Overall Solved Rate65%-7 pts53 → 72 → 65
Ignored %22%-2 pts30 → 24 → 22
Trusted Contributor %53%-2 pts35 → 55 → 53

K-9 Mail Forum#

forum.k9mail.app · all categories · April 2026
New Topics
50
3-mo: 38 → 50 → 50
Accepted Answer
4%
3-mo: 11 → 14 → 4%
Unanswered
40%
3-mo: 58 → 46 → 40%

Top Topic Themes

ThemeTopics3-mo trend
Crashes & Freezes82 → 3 → 8
Setup / Accounts72 → 10 → 7
Notifications64 → 4 → 6
Update regression50 → 5 → 5
Sync / Fetch34 → 3 → 3
Attachments33 → 3 → 3
Methodology — Topics sourced from the K-9 Mail Discourse forum (forum.k9mail.app) via the public Discourse search API, across all forum categories, filtered to the report month. Accepted answer % counts topics where a reply was marked as the solution — this undercounts actual resolution since many resolved threads are never formally marked. Unanswered % counts topics with zero replies. Themes are matched by keyword pattern against topic titles only. Data is fetched automatically at report generation time.

Desktop

SUMO forum · trending topics · engineering priorities · Mozilla Connect · April 2026

SUMO Forum#

SUMO · thunderbird · April 2026
Questions
733
-227 MoM
Solved Rate
64%
-3 pts MoM
Ignored %
23%
-26 pts MoM
MetricValueMoM3-mo trend
Questions (excl. spam)733-2271009 → 960 → 733
Overall Solved Rate64%-3 pts68 → 67 → 64
Ignored %23%-26 pts20 → 49 → 23
Trusted Contributor %45%-4 pts48 → 49 → 45
#TopicCount% of total
1Send/Receive issues19126.1%
2General messaging (broad tag)9913.5%
3Customization & UI8211.2%
4Import / Migration / Profiles587.9%
5Sign-in & Passwords567.6%
6Account setup & management466.3%
7Install & Update364.9%
8Spam & Junk mail304.1%
9Crashes & Performance263.5%
10Calendar & Events253.4%
ThemeQuestions% of total
1. Authentication / OAuth fragility
Heavy on Gmail, Outlook, Yahoo, Comcast provider failures. Recurring patterns: "stopped working after password change," "broke after Thunderbird update," repeated password prompts, connection / server reset, and friction with the new Account Setup Hub.
12116.5%
2. Update regressions
Visible across UI, send/receive, drag-and-drop, and folder display. Updates are breaking established workflows at scale — a release-process and regression-detection problem more than a feature problem.
557.5%
3. Data loss / folder integrity
Highest-emotional-charge bucket. Folders/emails disappearing, "wiped out all my folders," "Local Folders gone," "Recover Emails removed by Expunge." High urgency, high trust impact — these are the "I lost everything" tickets.
415.6%

Mozilla Connect — Community Wishlist#

20 ideas · 57 kudos · 3,875 views · full report →
KudosViewsStatusIdea
10379newStreamline New Email Notifications
8399newFeature request: Warning when sending from the wrong account (multi-account setups)
6177newRight click>>>show all messages from this sender (or domain)
4219newRequest for Restoration of Find Bar Match Count (Functional Regression
4226newBring Firefox VPN Functionality to Thunderbird (for Windows, Android, iOS)