A
Angeltek
Guest
Hi,
I'm trying to resolve what seems to be a common problem in here... one of my clients has been told by their hosting company that their server is sending spam in the form of backscatter. The server is based on CentOS 5 (64bit kernel v2.6.18) and uses a Plesk-specific version of qmail (psa-qmail v1.03-cos5.build95100504.10) as part of Plesk Panel v9.5.2.
I've had a look through this forum and have found quite a lot of posts on the issue, but so far haven't seen a comprehensive list of fixes. I have followed the instructions in http://kb.odin.com/766 and enabled "Reject mail to nonexistent user" for all the mail domains. I have also ensured that there are no wildcard addresses for any of the domains.
Is there anything else I need to do?
In particular I note that http://spamlinks.net/prevent-secure-backscatter.htm#reject-qmail lists a number of qmail patches related to "rcptto". I have read http://kb.odin.com/en/1161 on how to apply Plesk-specific patches to the vanilla qmail source code, but can't find information on what these patches actually do and whether they already deal with rcptto.
Cheers
Dom.
I'm trying to resolve what seems to be a common problem in here... one of my clients has been told by their hosting company that their server is sending spam in the form of backscatter. The server is based on CentOS 5 (64bit kernel v2.6.18) and uses a Plesk-specific version of qmail (psa-qmail v1.03-cos5.build95100504.10) as part of Plesk Panel v9.5.2.
I've had a look through this forum and have found quite a lot of posts on the issue, but so far haven't seen a comprehensive list of fixes. I have followed the instructions in http://kb.odin.com/766 and enabled "Reject mail to nonexistent user" for all the mail domains. I have also ensured that there are no wildcard addresses for any of the domains.
Is there anything else I need to do?
In particular I note that http://spamlinks.net/prevent-secure-backscatter.htm#reject-qmail lists a number of qmail patches related to "rcptto". I have read http://kb.odin.com/en/1161 on how to apply Plesk-specific patches to the vanilla qmail source code, but can't find information on what these patches actually do and whether they already deal with rcptto.
Cheers
Dom.