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@killyourfm @joey @neil But in case I am accused of twisting words more, Thurnderbird source code documents that it sends telemetry via Glean, as documented here: https://github.com/mozilla/releases-comm-central/blob/7d077663ca8d49a2645907e1da82214cb2e96090/docs/telemetry/index.md?plain=1#L2

With more details on Glean here: https://github.com/mozilla/releases-comm-central/blob/7d077663ca8d49a2645907e1da82214cb2e96090/docs/telemetry/index.md?plain=1#L2

The basic telemetry configuration collects things like the size of your mail box and how many accounts you have configured. It's not particularly invasive at first glance: https://github.com/mozilla/releases-comm-central/blob/7d077663ca8d49a2645907e1da82214cb2e96090/mail/metrics.yaml

When you search the source for "telemetry", you find...