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Problems with NDR

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=6965
Printed Date: 22 January 2025 at 8:06am


Topic: Problems with NDR
Posted By: ImInAfrica
Subject: Problems with NDR
Date Posted: 25 June 2011 at 2:15pm
Hi,
Below please see part of log from our SF installation.
We had an incidence where a specific mail server run out of disk space. the mail server reacted correctly by declining the message. SF acknowledged it, and acted correctly, BUT couldn't send the NDR back. I have marked the line in RED below.
Has anyone seen anything like this before?

06/17/11 10:55:03:460 -- (3072) RCPT TO: user@mydomain.com accepted
06/17/11 10:55:03:585 -- (3072) EMail from sender@senderdomain.com to user@mydomain.com passes Bayesian filter - 0% spam  (15ms)
06/17/11 10:55:03:585 -- (3072) Checking SURBL
06/17/11 10:55:03:585 -- (3072) Checking URLs in emails against MAPS
06/17/11 10:55:03:585 -- (3072) - URLs In MAPS search done... 
06/17/11 10:55:03:585 -- (3072) Start virus scan
06/17/11 10:55:03:585 -- (3072) Starting queueing procedures
06/17/11 10:55:03:585 -- (3072) EMail from sender@senderdomain.com to user@mydomain.com was queued. Size: 1 KB, 1024 bytes
06/17/11 10:55:03:585 -- (5472) Sending email from sender@senderdomain.com to user@mydomain.com -- 
06/17/11 10:55:03:726 -- (5472) EMail from: sender@senderdomain.com to: user@mydomain.com --  was returned to sender - server error - pop.bluelightit.com:25 said: Your message was received but it could not be saved. Please retry later. -- 
06/17/11 10:55:03:742 -- (3072) Starting bayesian procedures
06/17/11 10:55:03:757 -- (3652) Time to add Msg to Bayes corpus:0
06/17/11 10:55:03:820 -- (3072) Disconnect
06/17/11 10:55:03:867 -- (5472) There was an error sending the NDR: Your message was received but it could not be saved. Please retry later. -- 
06/17/11 10:55:03:867 -- (5472) server error - my.mailserver.com:25 said: Your message was received but it could not be saved. Please retry later. -- 

Thanks.


Replies:
Posted By: LogSat
Date Posted: 26 June 2011 at 10:03pm
The message being logged "Your message was received but it could not be saved. Please retry later" is what SpamFilter received when forwarding both the original email to the destination SMTP server for that recipient's domain (pop.bluelightit.com) and then to your default destination SMTP server when SpamFilter attempted to deliver the NDR (my.mailserver.com).

What SpamFilter does when receiving an error when forwarding to your destination SMTP server depends on the kind of error that your mail server output - a 400 error or a 500 error. How SpamFilter behaves in this case is determined by the following settings in the SpamFilter.ini file:

;Determines if SpamFilter should hold in the queue emails that were rejected by the destination SMTP server with an error in the 4xy range

QueueIfDestinationError400=true

 

;Determines if SpamFilter should hold in the queue emails that were rejected by the destination SMTP server with an error in the 5xy range

QueueIfDestinationError500=false


If your destination SMTP server is offline completely and unreachable, SpamFilter will queue the emails until it is back online.

The NDR email to the sender is thus sent if one of the above settings is set to "false" and is triggered, meaning the email is not queued for re-delivery. For example, with the settings above, if your destination SMTP server rejects SpamFilter's email with 500 error, then SpamFilter will not queue the email for re-delivery and will send the NDR. This NDR email is forwarded to your default SMTP server for delivery. If however your default SMTP server rejects this NDR, SpamFilter will not queue the NDR for delivery and will give up trying.



-------------
Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: ImInAfrica
Date Posted: 28 June 2011 at 4:59pm
ok got it. My system was set to send NDR via the same SMTP that is accepting the emails. I have found the entry called:

NotificationSMTPServer=

and have entered another smtp server address. Hopefully this won't happen again.

Thank you Roberto.


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