https://github.com/PHPMailer/PHPMailer
查看发送中的邮件 /var/spool/postfix/maildrop/
查看队列中的邮件 mailq
查看配置：postconf -n
删除队列中的邮件 postsuper -d ALL
队列中邮件重新发送postqueue -f
关闭邮件服务 /etc/init.d/postfix stop
邮件日志 /var/log/maillog
测试邮件mail -s test test@alanhou.org,若出现如下报错，请执行yum install mailx -y
-bash: mail: command not found
测试25端口 telnet alt2.gmail-smtp-in.l.google.com 25(这里以gmail为例，可选择其它网站)
出现类似connect to 127.0.0.1[127.0.0.1]:10024: Connection refused报错，尝试启动或重启amavis
service amavisd restart
yum install amavisd-new -y
amavis详细配置
http://wiki.centos.org/HowTos/Amavisd
工具：
出现类似Recipient address rejected: Greylisting in effect, please come back later的报错，是postfix的greylisting在作祟，配置文件(CentOS iredmail)在/etc/policyd/cluebringer.conf中，但是也可以在 /etc/postfix/main.cf文件中删除 check_policy_service inet:127.0.0.1:10031相关内容在取消屏蔽
/etc/pmta/config自定配置
reply /delivery not authorized/ mode=backoff #针对gmail
dmarc记录
_dmarc.example.com TXT "v=DMARC1; p=none; rua=mailto:aggregate@thirdparty.com"
