Extmail+postfix不能发信，认证失败

tail -f /var/log/maillog查看log发现如下信息：
postfix/smtpd[30348]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: No such file or directory

经检查安装cyrus-sasl的时候没做链接加上链接故障解决
ln -s /usr/local/lib/sasl2 /usr/lib/sasl2

完整安装过程如下：
安装cyrus-sasl-2.1.22:
cd cyrus-sasl-2.1.22/
./configure --disable-anon -enable-plain --enable-login \
--with-authdaemond=/usr/local/var/spool/authdaemon/socket
make
make install
ln -s /usr/local/lib/sasl2 /usr/lib/sasl2