Airmail preferences for > sierra 10.3

[jasperrooduijn]

The preferences directory has changes for > sierra 10.3. It would be nice if this could be changed :-)

For macOS Sierra 10.12 or earlier, backup/copy the following path ~/Library/Containers/it.bloop.airmail2 and restore it whenever required to the same location.

For macOS High Sierra 10.13 or later, backup/copy the folder, as shown in the screenshot above ~/Library/Group Containers/2E337YPCZY.airmail and restore it when required to the same location.