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Mozilla Thunderbird for Android Is Finally Here
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A place to discuss the news and latest developments on the open-source browser Firefox
Oh right, that's a server URL path, I thought it was just some config file one would have on their Linux host.
And this says that K-9 supports the same autoconfig as Thunderbird, so presumably the rebranded app would, too: https://forum.k9mail.app/t/autodiscover-autoconfig/7118