./configure --enable-allowroot
options: AllowRootLogin

./configure --enable-userconfig (enabled by default)
options: UserOverride

./configure --enable-apop
options: AllowAPOP, APOPServerName

./configure --enable-bulletins
options: UserBullFile, BulletinDirectory, AddBulletins

./configure --enable-expire (enabled by default)
options: ReadExpire, UnreadExpire

./configure --enable-mapping
options: UserMapFile, DoMapping, RequiredMapping

./configure --enable-nonip
options: AllowNonIP

./configure --enable-createmail
options: CreateMailDrop

./configure --enable-statistics
options: LogStatistics


Left options (always available):
MailDropName, MailDropType, AutoLogoutTime, ChangeGID, WrongCommandsLimit,
LogPriority
