Re: Is there a limit on incoming messages on a single connection?
Le 12/11/2010 20:03, Victor Duchovni a écrit : On Fri, Nov 12, 2010 at 10:06:46AM -0800, Rob Tanner wrote: Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. I am skeptical that it is in fact one recipient per message. Check your logs carefully. Do all the recipients get different queue-ids? The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. The client disconnects voluntarily, unless it exceeded an error counter. Postfix has a hard and soft error limit, but these are reset after each successful delivery. So exceeding the limits on consecutive errors should be infrequent. What I don?t know is whether outlook is disconnecting or whether postfix is closing the connection. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? Postfix would log the reason if it forced a client disconnect. I bet it's the anti-virus software on the client box...
Re: Is there a limit on incoming messages on a single connection?
On 13/11/10 08:53, mouss wrote: Le 12/11/2010 20:03, Victor Duchovni a écrit : On Fri, Nov 12, 2010 at 10:06:46AM -0800, Rob Tanner wrote: Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. I am skeptical that it is in fact one recipient per message. Check your logs carefully. Do all the recipients get different queue-ids? The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. The client disconnects voluntarily, unless it exceeded an error counter. Postfix has a hard and soft error limit, but these are reset after each successful delivery. So exceeding the limits on consecutive errors should be infrequent. What I don?t know is whether outlook is disconnecting or whether postfix is closing the connection. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? Postfix would log the reason if it forced a client disconnect. I bet it's the anti-virus software on the client box... More specifically, I know for a fact that AVast Anti-Virus has issues with sending large amount of email to a postfix server from outlook.
Is there a limit on incoming messages on a single connection?
Hi, Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. What I don¹t know is whether outlook is disconnecting or whether postfix is closing the connection. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? Thanks, Rob Tanner UNIX Services Manager Linfield College, McMinnville Oregon
Re: Is there a limit on incoming messages on a single connection?
On 11/12/2010 07:06 PM, Rob Tanner wrote: Hi, Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. What I don't know is whether outlook is disconnecting or whether postfix is closing the connection. Examine the log more carefully. If the client disconnects, this is logged as postfix/smtpd[PID]: disconnect from hostname[IP]. Unless the client exceeded a configured error limit, postfix will not disconnect the client. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? How do you know it is a single connection ? If this known-to-be-fairly-braindead MUA sends each message on a new SMTP connection, postfix may well exceed the configured error limit and start throttling the client. You need to figure out what is really happening :) Thanks, *Rob Tanner *UNIX Services Manager Linfield College, McMinnville Oregon -- J.
Re: Is there a limit on incoming messages on a single connection?
On Fri, Nov 12, 2010 at 10:06:46AM -0800, Rob Tanner wrote: Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. I am skeptical that it is in fact one recipient per message. Check your logs carefully. Do all the recipients get different queue-ids? The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. The client disconnects voluntarily, unless it exceeded an error counter. Postfix has a hard and soft error limit, but these are reset after each successful delivery. So exceeding the limits on consecutive errors should be infrequent. What I don?t know is whether outlook is disconnecting or whether postfix is closing the connection. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? Postfix would log the reason if it forced a client disconnect. -- Viktor.
Re: Is there a limit on incoming messages on a single connection?
On 11/12/10 10:27 AM, Jeroen Geilman jer...@adaptr.nl wrote: On 11/12/2010 07:06 PM, Rob Tanner wrote: Is there a limit on incoming messages on a single connection? Hi, Our admissions office sends out mass mailings to prospective students, anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via outlook to the postfix server, one recipient per message. The user reports that outlook sends out 500 messages and then stops. If he restarts outlook, it will send out another 500 and then stop again. If he leaves it overnight, it might send several more thousand by morning. When I look in the mail logs, somewhere around 500 messages, followed by a disconnect. What I don¹t know is whether outlook is disconnecting or whether postfix is closing the connection. Examine the log more carefully. If the client disconnects, this is logged as postfix/smtpd[PID]: disconnect from hostname[IP]. Unless the client exceeded a configured error limit, postfix will not disconnect the client. Is there a limit, configurable or otherwise, to the number of messages postfix can receive on a single connection? And at that point, does postfix close the connection to the client? How do you know it is a single connection ? The connects and disconnects are logged and I don¹t see multiple connects from the client (i.e., I don¹t see a connect followed by another connect without a disconnect in between). And from your comments above, it¹s clear that the client disconnected from the server and not the other way around which strongly suggests that this is an outlook/user issue and not at all related to the server. If this known-to-be-fairly-braindead MUA sends each message on a new SMTP connection, postfix may well exceed the configured error limit and start throttling the client. You need to figure out what is really happening :) Thanks, Rob Tanner UNIX Services Manager Linfield College, McMinnville Oregon
