May 2026 — Thunderbird Support Dashboard

Full report on GitHub →

May 2026 report · generated 2026-06-03

Total Tickets
606
+17.4% MoM
Overall CSAT
76.7%
-1.0 pts MoM

Donor Care

279 tickets · Zendesk
Donor CSAT
66.7%
-10.3 pts MoM

Seven of nine bad ratings were noise — wrong channel, misdirected tickets, a donor who went quiet after asking about donation numbers. The one that matters: a real gap in our German-language donor KB.

Donor Tickets
279
-44.2% MoM

Thundermail

118 tickets · Zendesk
Thundermail CSAT
92.9%*
Thundermail Tickets
118
+637.5% MoM

*Both dissatisfied ratings (DSATs) were misdirected emails to Thundermail, remediated via thunderbird-accounts#834.

Top Ideas All-Time

IdeaVotesTag
Webmail for Thundermail56Thundermail
Additional pricing tiers48Accounts & Subscriptions
Multifactor Authentication44Privacy & Security
DNSSEC/DANE Support38Thundermail
Increase custom domains limit35Thundermail

Android

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

Play Store Reviews#

493 reviews · TB 385 (348 stable + 37 beta) · K-9 108 · 32 languages
⚠️ Play Store Rating — Q2 Trend

TB: 3.73★ this month (-0.08 from April). Track against 4★ annual goal.

TB Avg Rating
3.73★
-0.08 from April
K-9 Avg Rating
3.53★
+0.57 from April
Play Store Tickets
209
Up from 205

Tickets are opened only for low-star reviews (1–3★) that we reply to — not every review generates a ticket.

Star Distribution — TB (385 reviews)

Star Distribution — K-9 (108 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 51 34 2.94★ 35 16 31 → 37 → 34 📉
Spam Filter Absent 11 8 2.82★ 11 0 10 → 12 → 8 📉
Crashes & Freezes 5 5 1.80★ 4 1 6 → 9 → 5 📉
Calendar Missing 7 3 3.43★ 5 2 6 → 5 → 3 📉
Stuck Outbox / Send Failure 4 4 2.50★ 2 2 4 → 1 → 4 📈
QR / Settings Import 6 3 3.83★ 6 0 4 → 1 → 3 📈
Email Headers / Print 2 2 3.00★ 2 0 2 → 2 → 2 ➡️

Top 10 Languages — Play Store

LanguageReviews
English157
German118
Spanish29
Russian29
French25
Polish21
Italian20
Japanese17
Portuguese12
Dutch9

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 · May 2026
Questions
55
-18 MoM
Solved Rate
64%
-1 pts MoM
Ignored %
31%
+9 pts MoM
MetricValueMoM3-mo trend
Questions (excl. spam)55-1866 → 73 → 55
Overall Solved Rate64%-1 pts72 → 65 → 64
Ignored %31%+9 pts24 → 22 → 31
Trusted Contributor %44%-9 pts55 → 53 → 44

Top Contributors — SUMO · 51 total answers · 11 solutions

UsernameAnswersSolutions
platform34409

Mozilla Connect — Community Wishlist#

15 ideas · view all on Mozilla Connect →
#IdeaKudosMoM
1Calendar support on Thunderbird mobile327
2Android version of Thunderbird286
3Allow HTML signatures in K-9 Mail/Thunderbird for Android153
4filtering with Android Thunderbird99
5Give Thunderbird for Android a "send later" function96
6Tags on Thunderbird Android87
7S/MIME support for K-9 Mail Android77
8Display Subfolders in tree structure (like on thunderbird for desktop)76
9Add the ability to create IMAP folders65
10AI detection tool65

K-9 Mail Forum#

forum.k9mail.app · all categories · May 2026
New Topics
38
3-mo: 50 → 50 → 38
Accepted Answer
8%
3-mo: 14 → 4 → 8%
Unanswered
32%
3-mo: 46 → 40 → 32%

Top Topic Themes

ThemeTopics3-mo trend
Sync / Fetch53 → 3 → 5
Setup / Accounts510 → 7 → 5
Crashes & Freezes23 → 8 → 2
Notifications24 → 6 → 2
Update regression25 → 5 → 2

Top Contributors

No contributors with 3+ answers this month.

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 · May 2026

SUMO Forum#

SUMO · thunderbird · May 2026
Questions
802
+69 MoM
Solved Rate
70%
+6 pts MoM
Ignored %
17%
-6 pts MoM
MetricValueMoM3-mo trend
Questions (excl. spam)802+69960 → 733 → 802
Overall Solved Rate70%+6 pts67 → 64 → 70
Ignored %17%-6 pts49 → 23 → 17
Trusted Contributor %49%+4 pts49 → 45 → 49
#TopicMarchAprilMay3-mo avg
1Send/Receive issues 259
27.0%
191
26.1%
250
31.2%
28.1%
2General messaging (broad tag) 119
12.4%
99
13.5%
101
12.6%
12.8%
3Customization & UI 102
10.6%
82
11.2%
94
11.7%
11.2%
4Sign-in & Passwords 89
9.3%
56
7.6%
66
8.2%
8.4%
5Import / Migration / Profiles 53
5.5%
58
7.9%
51
6.4%
6.6%
6Account setup & management 72
7.5%
46
6.3%
49
6.1%
6.6%
7Spam & Junk mail 31
3.2%
30
4.1%
33
4.1%
3.8%
8Crashes & Performance 33
3.4%
26
3.5%
28
3.5%
3.5%
9Install & Update 36
3.8%
36
4.9%
27
3.4%
4.0%
10Calendar & Events 32
3.3%
25
3.4%
26
3.2%
3.3%
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.
14518.1%
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.
435.4%
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.
546.7%

Mozilla Connect — Community Wishlist#

25 ideas · 43 kudos · 3,073 views · full report →
KudosViewsStatusIdea
4189newPinned Messages - Things to Do
3163newTo sort the conditions in a Thunderbird filter's rules
3144newOption to exclude calendar event emails from search in Thunderbird
3134newCalendar Print today and forward
3252newFeature Request: Native PST Import Without Requiring Outlook Installation

Top Contributors — SUMO · 1,980 total answers · 169 solutions

UsernameAnswersSolutions
davidsk42637
rednoise15826
MattAuSupport10913
Mapenzi1037
@next797