Go Back   HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials > ISPConfig 2 > Installation/Configuration

Do you like HowtoForge? Please consider supporting us by becoming a subscriber.
Closed Thread
 
Thread Tools Display Modes
  #1  
Old 20th November 2007, 20:22
ChrisBeach ChrisBeach is offline
Junior Member
 
Join Date: Nov 2007
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default Backscatter problems, tried everything :(

Hey All,

A bit about my setup:

I have postfix running on my firewall which is relaying emails to our lotus notes server.

For the past 6 days we've been receiving at least 200 msgs/min (up to 1400/min), (typical rejected email is 10/min for my server) of backscatter email. This brought the server to a halt the first day, so I blocked null-senders <> . Obviously this isn't good since now my users won't get notices if they email incorrect addresses.

I've been googling for days, and have put several policies in place, but still, if spammers use our valid user email addresses when bouncing spam off of other servers, and those servers have proper dns records and make it past my spam filter, then my users will be getting a lot of email.

I see my two choices as being either continue blocking <> from any source, or have an allow list with a list of all my valid email users, but even then, that only prevents backscatter to non-valid users.

Is there anything anyone has done to solve these problems? Some database that maintained outbound email and would only allow bounces from domains that that were emailed would be nice, but google came up with nothing
Sponsored Links
  #2  
Old 20th November 2007, 21:16
edge edge is offline
Moderator
 
Join Date: Dec 2005
Location: The Netherlands
Posts: 2,034
Thanks: 265
Thanked 152 Times in 132 Posts
 
Default

Please do not double post!

http://www.howtoforge.com/forums/showthread.php?t=17509
__________________
Never execute code written on a Friday or a Monday.
Closed Thread

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Problems with groups/grpconv linuxfast General 28 21st April 2008 09:35
Problems with freezing and kernel error anebi Server Operation 2 19th August 2007 14:06
Empty Recycle Bin jon335 General 40 6th May 2006 11:56
Help! Real newbie having problems installing Linux t-kiss Kernel Questions 5 4th April 2006 15:14
problems mysql rayit General 15 1st April 2006 04:57


All times are GMT +2. The time now is 04:33.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.