sendmail发送慢的问题

1.使用python的脚本，发送邮件。代码如下:

点击查看代码

[root@ZabbixServerMasterNode ~]# cd /etc/zabbix/alertscripts/
[root@ZabbixServerMasterNode alertscripts]# cat sendmail.py 
#!/bin/env python
#coding:utf-8
 
import smtplib  
from email.mime.text import MIMEText  
from sys import argv
 
mailto_list=[]
mail_host="xxx.xxx.cn"
mail_user="xxx.cn"
mail_pass="xxxx"
debug_level=0
 
def send_mail(to_list,sub,content):
    me=mail_user
    msg = MIMEText(content,_subtype='plain',_charset='utf-8')
    msg['Subject'] = sub  
    msg['From'] = me  
    msg['To'] = ";".join(to_list)
    try:
        server = smtplib.SMTP_SSL(mail_host, 465)
        server.connect(mail_host)
        server.login(mail_user,mail_pass)
        server.sendmail(me,to_list,msg.as_string())
        server.close()
        return True  
    except Exception, e:
        print str(e)
        return False  
if __name__ == '__main__':
    mailto_list=argv[1].split(';')
    sub=argv[2]
    content=argv[3] 
    send_mail(mailto_list,sub,content)

通过调用上述代码，发现特别的慢。
后面查看是主机定义的新的hostname，但是hosname没有配置。
通过配置/etc/hosts
解决邮件发送慢的问题。