Thanks to everybody who posted their experiences here.
I successfully used imapsync
to move a large mailbox (40k messages, 14GB) from webfaction to opalstack. It took 70 minutes and 547MB memory.
I used @aa11's commandline and it worked as expected.
Before that I wasted a bunch of time trying to get mbsync
to work, but it kept using up all my memory, and getting killed. Finally found @vsajip's comment about the relative memory use of mbsync
vs imapsync
.
Anyway, @sean I do think you should update the official guidelines to at least mention the potential memory problems with mbsync
and some basic instructions for imapsync
usage.