smtplib send mail dns resolve problem

2009-10-19 Thread 星星 
hello everyone,
 I am using smtplib to send email, and i meet such a problem:

my email smtp server hostname can be parsed to 5 ips, for example:
**
 my email smtp server hostname:  email-my.local.com
 ips through dns parse:
1.1.1.1
1.1.1.12
1.1.13.1
1.1.1.14
1.1.1.15
**

but when i send mail using smtplib, i was always using one ip, no
dns re-resolve happened, (for example: only use 1.1.1.12). I checked
smtplib src code, but i can't find anything strange;

here is my smtplib send mail client code:
 

for i in range(1000):
server = smtplib.SMTP(host)
try:
 server.sendmail(fromaddr, toaddr, msg)
except Exception, e:
 logger.warning('sendmail exception')
else:
 pass
finally:
 server.quit()
time.sleep(0.3)
 


Can anyone give some tips? Thank you!
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Re: smtplib send mail dns resolve problem

2009-10-19 Thread Gabriel Genellina 
En Mon, 19 Oct 2009 05:44:14 -0200, 星星 starstarstar...@gmail.com  
escribió:



my email smtp server hostname can be parsed to 5 ips, for example:
**
 my email smtp server hostname:  email-my.local.com
 ips through dns parse:
1.1.1.1
1.1.1.12
1.1.13.1
1.1.1.14
1.1.1.15
**

but when i send mail using smtplib, i was always using one ip, no
dns re-resolve happened, (for example: only use 1.1.1.12). I checked
smtplib src code, but i can't find anything strange;


smtplib does not issue a dns query for a MX record, if that is what you  
were expecting. In fact, the Python standard library does not contain any  
module for DNS handling.



for i in range(1000):
server = smtplib.SMTP(host)


Here, `host` is used directly -- whatever address gethostbyname returns.  
If you want load balancing among the 5 addresses above, you'll have to do  
it yourself:

host = random.choice(list_of_addresses)

If you don't want to hardcode the addresses, there are a few libraries  
that perform DNS queries in PyPI.


--
Gabriel Genellina

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Re: smtplib send mail dns resolve problem

2009-10-19 Thread 星星 
On 10月19日, 下午11时05分, Gabriel Genellina gagsl-...@yahoo.com.ar
wrote:
 En Mon, 19 Oct 2009 05:44:14 -0200, 星星 starstarstar...@gmail.com  
 escribió:

      my email smtp server hostname can be parsed to 5 ips, for example:
      **
       my email smtp server hostname:  email-my.local.com
       ips through dns parse:
      1.1.1.1
      1.1.1.12
      1.1.13.1
      1.1.1.14
      1.1.1.15
      **

      but when i send mail using smtplib, i was always using one ip, no
  dns re-resolve happened, (for example: only use 1.1.1.12). I checked
  smtplib src code, but i can't find anything strange;

 smtplib does not issue a dns query for a MX record, if that is what you  
 were expecting. In fact, the Python standard library does not contain any  
 module for DNS handling.

      for i in range(1000):
          server = smtplib.SMTP(host)

 Here, `host` is used directly -- whatever address gethostbyname returns.  
 If you want load balancing among the 5 addresses above, you'll have to do  
 it yourself:
      host = random.choice(list_of_addresses)

 If you don't want to hardcode the addresses, there are a few libraries  
 that perform DNS queries in PyPI.

 --
 Gabriel Genellina

thanks very much! I tried your suggestion and it worked!

But I still wonder why gethostbyname returns the same address all the
time(maybe 5 times).
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