As my email inbox is only 1GB of size, I move important mails to local folders to keep them.On Thunderbird for Desktop this works very well. The local folder is transfered with nextcloud to all my devices. Unfortunately on my android phone I can not ...
Hello!in the very deep thunderbird settings you must change"mail.store_conversion_enable" to "true". (It is the kind of setting menu like about:config in firefox)It worked for me, I could even convert existing mbox local folder to maildir local fold...
I do backup my emails via moving them to local folder on desktop thunderbird. The local folder on my desktop computer is then sync to my nexcloud and from there to my phone.It would be great if I could open this backuped emails on my phone.