Nachdem man die initiale Konfiguration durchgeführt hat, kann man mittels imapsync die Daten eines anderen Servers übernehmen.

$ apt-get install imapsync

Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  libdigest-hmac-perl libdigest-sha1-perl libmail-imapclient-perl libparse-recdescent-perl
  libterm-readkey-perl
The following NEW packages will be installed:
  imapsync libdigest-hmac-perl libdigest-sha1-perl libmail-imapclient-perl
  libparse-recdescent-perl libterm-readkey-perl
0 upgraded, 6 newly installed, 0 to remove and 1 not upgraded.
Need to get 426kB of archives.
After unpacking 2101kB of additional disk space will be used.
Do you want to continue? [Y/n] y
...

time imapsync --host1 mailhost1 --user1 mailuser1 --password1 mailuser1pass \
 --host2 127.0.0.1 --user2 hulauser1 --password2 hulapass1 --include "^INBOX"