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by jcranmer 4132 days ago
One thing that Thunderbird reports back to servers is telemetry usage, which helps provide feedback on whether or not rare charsets (e.g., VISCII) need to be supported or how much weight should be placed on implementation of, say, NTLM or GSSAPI.

Also, Thunderbird permits neither JavaScript nor plugins to run in emails. It does permit plugins in cases such as displaying an RSS feed inline.