(93) Can you allow installation/data storage on external storage media (sdcard)?
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FairEmail uses services and alarms, provides widgets and listens for the boot completed event to be started on device start, so it is not possible to store the app on external storage media, like an sdcard. See also here.
+Since the app is small anyway and the data files will be stored in the same place, the benefit would be limited anyway.
Messages, attachments, etc stored on external storage media, like an sdcard, can be accessed by other apps and is therefore not safe. See here for the details. Instead, consider to use adoptable storage.
Since version 1.1829 is it possible to store attachments to external storage space private to the app (except for file managers) via an option in the debug panel. You can enable the debug panel by enabling debug mode in the miscellaneous settings (last option). To prevent ongoing operations from storing attachments at the old location you should disable receiving messages in the receive settings and wait until all operations have been completed before changing this option. Please be aware that removing the storage space will inevitably result in problems, which is one of the reasons why this option is hidden.
Moving messages to an sdcard is not an option because this would significantly reduce the response times of the app.