Mail import fails repeatedly
Hi,
My computer's hard drive failed, so I've been recovering from a backup. (The computer is an iMac running mojave 10.14.6.)
I installed Mojave on a new external drive, then restored from a time machine backup onto that drive, and am booting from the external drive, while I sort out fixing the painful-to-access internal one.
Things are (partly) recovering, except when I try to open the apple Mail client. Mail had worked fine previously, and I'm using the same OS version as on the backup, however it now insists "Mail needs to import your messages. This might take a few minutes...." It takes several hours, with the bar graph inching up until the very end then tells me that the import "failed" and offers a very unhelpful message to the effect that I should make sure that I have enough space in my home folder. (I have several TB.) This occurs repeatedly.
Any ideas? My old e-mail is critical....
Thanks!
-Mike
iMac 27″, macOS 10.14