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Old 07-25-2011, 08:52 AM   #1
adrianTNT
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Registered: Jul 2011
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Question Questions about Sendmail, logging and identifying bounces


Hello.
I have some questions about Sendmail (on CentOS) ...

In the /var/log/maillog there is a number next to ctladdr and I have no idea what is.

Code:
... to=John <john@example.com>, ctladdr=noreply@myserver.com (48/48), ...
1. What is the 48 of 48 ? Is there some kind of internal queue per sender? If so, where do I increase it?

2. Is there a reliable program that can analyze logs and list the bounce emails and date? I need it to filter old site subscribers.
By "reliable" I mean one that doesn't need 20 other components installed, because is a simple job of filtering a log file.

3. For the log filtering, maybe someone knows a SSH command that reads log, looks for " dsn=5.x.x" delivery error and saves the receiver and date to a text file.

Thanks.
 
Old 07-25-2011, 03:45 PM   #2
sandwormusmc
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Quote:
Originally Posted by adrianTNT View Post
Hello.
I have some questions about Sendmail (on CentOS) ...

In the /var/log/maillog there is a number next to ctladdr and I have no idea what is.

Code:
... to=John <john@example.com>, ctladdr=noreply@myserver.com (48/48), ...
1. What is the 48 of 48 ? Is there some kind of internal queue per sender? If so, where do I increase it?

2. Is there a reliable program that can analyze logs and list the bounce emails and date? I need it to filter old site subscribers.
By "reliable" I mean one that doesn't need 20 other components installed, because is a simple job of filtering a log file.

3. For the log filtering, maybe someone knows a SSH command that reads log, looks for " dsn=5.x.x" delivery error and saves the receiver and date to a text file.

Thanks.
That may all sound like a simple job on the surface, but what happens when:

- The script/program runs every five minutes, and keeps finding the same entries in the log (so it keeps writing the same lines to the text file)?
- The script/program modifies the log file to mark that entry as found, and messes up a program that also currently has the log file open?

As for Sendmail, http://etutorials.org/Server+Administration/Sendmail/ seems to be a good reference manual for Sendmail options ... I didn't see anything that stood out right away, as the MaxRecipientsPerMessage is set to unlimited by default.
 
Old 07-25-2011, 04:32 PM   #3
adrianTNT
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Registered: Jul 2011
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It doesnt need to run often, once a day or every 3 days.
A current temp solution might work ok though: Mail log is copied to a temp folder by chrontab and a php script is run to load and filter dates and bounces from that file, it saves all to database (bounce address and date) then on next run it can skip the ones older than last date from database.
Unless someone has a better solution I will use what I have.

The other question remains, anyone knows what is the 48/48 next to ctladdr ? I could not find any info. I also have it as "(0/0)" and I seen it somewhere, I think on other logs online as (35/35) or something similar.
It is part of the ctladdr because the next coma is after* it.

Code:
Jul 24 10:13:02 ip-10-170-14-112 sendmail[13169]: p6OAZZZ13169: to=SomeUser <someuser@example.com>, ctladdr=noreply@myserver.com (48/48), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=31046, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p6OAZZZ13170 Message accepted for delivery)
 
Old 07-25-2011, 05:19 PM   #4
bathory
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Hi,
Quote:
The other question remains, anyone knows what is the 48/48 next to ctladdr ? I could not find any info. I also have it as "(0/0)" and I seen it somewhere, I think on other logs online as (35/35) or something similar.
It's the control user and its uid/gid. For more details take a look here

Regards

Last edited by bathory; 07-25-2011 at 05:22 PM.
 
  


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