在阿里云centos7上使用python3 MIMEText smtplib发送邮件超时

python3.5.2,
代码：

from email.mime.text import MIMETextimport smtplib

msg = MIMEText('hello world','plain','utf-8')
#1、邮件内容。2、plain表示纯文本。3、utf-8编码

from_addr = " 12345@qq.com"#Email地址
password = "12345"#密码
to_addr = " 12345@qq.com"#收件人地址
port = 25


server = smtplib.SMTP(smtp_server, port)
#1、SMTP服务器。2、端口

server.set_debuglevel(1)#打印出与SMTP服务器交互信息,True打印，False不显示。（真假）

server.login(from_addr,password)
#1、Email地址。2、密码。登录STMP服务器

server.sendmail(from_addr, [to_addr], msg.as_string())#sendmail 发送邮箱，可以一次发送多人
#1、发送人，2、收件人，3、内容,as_string()把MIMEText对象变成str

server.quit()



然后等了很久 提示：

Traceback (most recent call last):  File "regiemail.py", line 30, in <module>
    server = smtplib.SMTP(smtp_server, port)  File "/usr/local/python3/lib/python3.5/smtplib.py", line 251, in __init__
    (code, msg) = self.connect(host, port)  File "/usr/local/python3/lib/python3.5/smtplib.py", line 335, in connect
    self.sock = self._get_socket(host, port, self.timeout)  File "/usr/local/python3/lib/python3.5/smtplib.py", line 306, in _get_socket
    self.source_address)  File "/usr/local/python3/lib/python3.5/socket.py", line 711, in create_connection
    raise err  File "/usr/local/python3/lib/python3.5/socket.py", line 702, in create_connection
    sock.connect(sa)TimeoutError: [Errno 110] Connection timed out




在win10上，直接执行代码成功，把代码传到阿里云的centos7上，就提示超时了.