IMAP mailbox names are encoded in a modified UTF-7 when names contains international characters outside of the printable ASCII range. The modified UTF-7 encoding is defined in RFC2060(section 5.1.3).
acquired package info from repodata DB: repodata/69e709f4d2852d98f12867a74015d19384fe2727ff670fd70178cdde80b1e77e-primary.sqlite.bz2