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Email address missing from "From" field on emails sent through Thunderbird 38

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I've been having problems with emails sent through two addresses using different servers set up on Thunderbird not arriving with their sender email address. This is only happening since upgrade to Thunderbird 38. I have reinstalled 37 and everything is fine, upgraded again using "Help" "About Thunderbird" and the problem recurs. I haven't tried installing 38 directly from a download. It doesn't happen when I send using GMail through Thunderbird, presumably GMail's systems insert the correct information.

I've been having problems with emails sent through two addresses using different servers set up on Thunderbird not arriving with their sender email address. This is only happening since upgrade to Thunderbird 38. I have reinstalled 37 and everything is fine, upgraded again using "Help" "About Thunderbird" and the problem recurs. I haven't tried installing 38 directly from a download. It doesn't happen when I send using GMail through Thunderbird, presumably GMail's systems insert the correct information.

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You might want to file a bug for that in Bugzilla, but try safe mode first. Hold shift while starting Thunderbird. Just in case it is an add-on that has failed the update.

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Chosen Solution

You might want to file a bug for that in Bugzilla, but try safe mode first. Hold shift while starting Thunderbird. Just in case it is an add-on that has failed the update.

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Bug filed 5 days ago, and lots of discussion had and probably solution on the way, see https://bugzilla.mozilla.org/show_bug.cgi?id=1152045