Solved

procmail recipies

Posted on 2014-09-04
9
139 Views
Last Modified: 2014-09-17
is it possible to detect a missing TO 'field' in an email header?
0
Comment
Question by:camstutz
  • 5
  • 4
9 Comments
 
LVL 62

Accepted Solution

by:
gheist earned 500 total points
ID: 40305698
| sed '/^$/q' | grep ^To:\  
(there are two spaces at the end)

Cut headers and look for To:(space) header

btw RFC says From: and Date: are required, and between lines that relayed mail (like all from internet) should have Received: hheader inside
0
 

Author Comment

by:camstutz
ID: 40307080
Hello gheist,

I appreciate your help. I am newer to procmail, so I am going to be testing this. My main goal is that we get a lot of blank emails that goes in waves. A quick Google search shows we are not a lone. These emails are literally missing the body, and have no from or to lines in the body It has a delivered-to and return-path field. They also have a non-standard header (in the since that it is missing a lot of the delivery path information and other normally seen fields.

I was hoping to catch something these with a procmail recipe that would look for the absence of these blank emails.
0
 

Author Comment

by:camstutz
ID: 40307104
I re-read my initial post... I'm sorry, I wrote it inappropriately... I was meaning missing the to field completely.
0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 
LVL 62

Expert Comment

by:gheist
ID: 40309333
You need to set up some greylisting. That forces spammer to use queueing mail server instead of blind script.
Hope this helps
0
 

Author Comment

by:camstutz
ID: 40327683
Sorry for the Delay,

Unfortunately, Greylisting isn't an option for me. I was hoping it do it directly in procmail
0
 
LVL 62

Expert Comment

by:gheist
ID: 40327700
Well I have shown you filter for procmail to check for To: header in message body. That answers your question.
Greylisting keeps most of spam out of mailboxes without much load on mailserver (like 2 commands per message with my filter)
0
 

Author Comment

by:camstutz
ID: 40328126
Thanks gheist... I do appreciate the greylisting info though, just my superiors do not like the option at this point.
My last question before I award points, is on that sed recipe, do I use the * to start the line?

 * | sed '/^$/q' | grep ^To:\  

If there is an article about this I would be willing to read it.

Thanks
0
 
LVL 62

Expert Comment

by:gheist
ID: 40328190
Yessire....
0
 
LVL 62

Expert Comment

by:gheist
ID: 40328803
I just added some commands that reads to first blank line
then other that checks for to: header
some command tutorials on grep / sed /awk and regular expressions are easy to find on internet....
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Linux VM 6 87
SonarQube on Linux vs Windows 3 26
Changed email server and mail going to both servers 19 37
000webhost.com default error log 1 25
Resolve Outlook connectivity issues after moving mailbox to new Exchange 2016 server
Marketers need statistics and metrics like everybody else needs oxygen. In this article we explain how to enable marketing campaign statistics for Microsoft Exchange mail.
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

785 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question