mastodon.online is one of the many independent Mastodon servers you can use to participate in the fediverse.
A newer server operated by the Mastodon gGmbH non-profit

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@thunderbird I have been using #K9 for a while now through #FDroid. Will K9 update/merge into #Thunderbird? Or should I uninstall K9 then install Thunderbird?

@Dustwin They're separate apps. You can import account settings data into Thunderbird from K-9 Mail so don't delete K-9 Mail until you've had the chance to do that!

@thunderbird That was easy! Thanks for that information, made the switch so easy.