Original sender is not correctly identified when spam is forwarded
- by Stephan Burlot
I have a forwarding rule with Postfix that forwards all messages to my main email address.
When a spam message is sent to one of my emails, it is forwarded but the sender is shown as being the forwarding domain, not the spammer's domain.
Real example:
mywebsite.com is hosted on Linode.
[email protected] sends an email to [email protected]
the mail is forwarded to [email protected]
my email hosting (anotherwebsite.com) sees it's spam and sends a message to [email protected] and Linode reports a TOS violation.
I have modified my postfix settings so I now use RBL, but if a message goes through, it may happen again.
How can I prevent this to happen again?
Is there some settings to change on Postfix so the original sender is correctly identified?
Thanks
Stephan
EDIT:
The steps I did to prevent this to happen again are:
Add RBL checking to Postfix
Add postgrey to Postfix
And finally fix the MX record which was incorrect.
I checked with a test email on Spamcop.net and the original sender is correctly identified.