./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, PreAuthMap

./configure --enable-nonip
options: AllowNonIP

./configure --enable-createmail
options: CreateMailDrop

./configure --enable-statistics
options: LogStatistics

./configure --enable-dpuid
options: DpUIDUser, DpUIDDBFile, DpUIDEnable

./configure --enable-logextend
options: AuthLog

./configure --with-sasl
options: SASLMinSSF, SASLMaxSSF, SASLAllow

./configure --with-openssl
options: TLSCertFile, TLSKeyFile, TLSDCertFile, TLSDKeyFile, TLSCAFile,
TLSCAPath, TLSDH512ParamFile, TLSDH1024ParamFile, TLSCipherList, TLSAskCert,
TLSRequireCert, TLSVerifyDepth, TLSAllow, TLSLogLevel, TLSWrap, TLSRequire

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