原文地址：http://bbs.chinaunix.net/viewthread.php?tid=770141
执照wangmingda老大的资料安装成功postfix（地址在这里http://www.extmail.org/forum/archive/2/0510/563.html）。现在把我安装过程中遇到的问题及解决方法提供给大家，以方便新手。高手就不要看了
说明一下：Q代表安装过程中遇到的问题，或者是日志中出现的现象。A：代表解决方法。
在这里要感谢：hzqbbc,≠&键盘人生$，606,鸟无生计等其他帮助过我兄弟们。
QUOTE:
Q：
Jan 13 11:26:29 mail authdaemond: failed to connect to mysql server (server=localhost , userid=postfix ): Unknown MySQL server host 'localhost ' (2)
Jan 13 11:26:29 mail postfix/smtpd[2829]: warning: SASL authentication failure: could not verify password
Jan 13 12:11:19 mail authdaemond: failed to connect to mysql server (server=localhost, userid=postfix ): Can't connect to local MySQL server through socket '/tmp/mysql.sock ' (2)
Jan 13 12:11:19 mail postfix/smtpd[2870]: warning: SASL authentication failure: could not verify password
A:
将vi /usr/local/courier-authlib/etc/authmysqlrc中参数后的空格删除即可
QUOTE:
Q：
编译pam_mysql：
[root@mail src]# tar -zxf pam_mysql-0.5.tar.gz
[root@mail src]# cd pam_mysql
修改pam_mysql.c的源代码，去掉调试消息：
[root@mail pam_mysql]# vi +54 pam_mysql.c
将如下一行：
#define DEBUG
修改为：
然后编译：
[root@mail pam_mysql]# make
然后报错“make: *** [dynamic/pam_mysql.o] Error 1”无法尽心，没有生成pam_mysql.so模块。
A:
装mysql的devel和shared包吧，对应版本的，用mysql.com上面的就行
QUOTE:
Q：
安装POSTFIX2.2.7出错
[root@mail postfix-2.2.7]# make
make -f Makefile.in MAKELEVEL= Makefiles
(echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) >makedefs.tmp
No <db.h> include file found.
Install the appropriate db*-devel package first.
See the RELEASE_NOTES file for more information.
make: *** [Makefiles] Error 1
make: *** [Makefiles] Error 2
A:
没装berkeleyDB的开发库，或者是指定路径没有找到，所以报这个错了。如果是linux， 注意看有没有db*-devel的rpm，或者libdb*-dev的deb（debian）如果是bsd，则看看有没有装db3/db4等包
QUOTE:
Q：
按照Postfix+Cyrus-IMAP+Cyrus-SASL+MySQL+IMP（王兴宇的）完全指南进行到了步骤8.5 ,用cyradm创建邮箱,可是却出现了如下错误:
[root@localhost bin]# cyradm --user cyrus localhost
Can't load '/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/auto/Cyrus/IMAP/IMAP.so' for module Cyrus::IMAP: /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/auto/Cyrus/IMAP/IMAP.so: undefined symbol: db_version at /usr/lib/perl5/5.8.5/i386-linux-thread-multi/DynaLoader.pm line 230.
at /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/Cyrus/IMAP/Admin.pm line 44
Compilation failed in require at /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/Cyrus/IMAP/Admin.pm line 44.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/Cyrus/IMAP/Admin.pm line 44.
Compilation failed in require at /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/Cyrus/IMAP/Shell.pm line 60.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/Cyrus/IMAP/Shell.pm line 60.
Compilation failed in require.
BEGIN failed--compilation aborted.请问是什么原因?应该怎么解决?
A:
安装了perl－Cyrus包后就好了。
QUOTE:
Q：
[root@mail postfix]# /usr/sbin/postfix start
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/hold
postsuper: fatal: scan_dir_push: open directory hold: Permission denied
postfix/postfix-script: fatal: Postfix integrity check failed!
呵呵权限问题，看你的postfix的用户和用户组是什么。是/usr/sbin/postfix的权限吗？我改为1777还是不行
A:
chown postfix:postfix /var/spool/postfix/hold
QUOTE:
Q：
Oct 24 11:38:24 qmail postfix/smtpd[2004]: warning: SASL authentication failure: Password verification failed
Oct 24 11:38:24 qmail postfix/smtpd[2004]: warning: unknown[221.221.172.11]: SASL plain authentication failed无法通过认证，请问高手这是什么原因？
A:
将main.cf中的smtpd_sasl_local_domain设为空即可。
QUOTE:
Q：
Oct 24 11:38:24 qmail postfix/smtpd[2004]: warning: SASL authentication failure: Password verification failed
Oct 24 11:38:24 qmail postfix/smtpd[2004]: warning: unknown[221.221.172.11]: SASL plain authentication failed无法通过认证，请问高手这是什么原因？
A:
将main.cf中的smtpd_sasl_local_domain设为空即可。
QUOTE:
Q：
[root@mail postfix]# /usr/sbin/postfix start
postfix/postfix-script: warning: not owned by group postdrop: /var/spool/postfix/public
postfix/postfix-script: warning: not owned by group postdrop: /var/spool/postfix/maildrop
postfix/postfix-script: warning: not owned by root: /var/spool/postfix/etc
postfix/postfix-script: starting the Postfix mail system
A:
chgrp postdrop /var/spool/postfix/maildrop
chgrp postdrop /var/spool/postfix/public
QUOTE:
Q：
[root@mail postfix]# /usr/sbin/postfix start
postfix/postfix-script: warning: not owned by root: /var/spool/postfix/etc
postfix/postfix-script: starting the Postfix mail system
A:
chown root /var/spool/postfix/etc
QUOTE:
Q：
postalias: warning: /usr/local/etc/postfix/aliases.db: duplicate entry: "root"
A:
这个已经很清楚告诉您，您的aliases档案内有重复的root别名设定。修正一下该问题吧.. 
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