On 9/17/2009 12:55 PM, wiskbr...@hotmail.com wrote:
Don't confuse the envelope sender as logged by Postfix with
the From: header displayed by your mail client.
Thanks. Is their a way to ensure that these are the same? How can I ensure
that the From: header displayed by my mail clients are not allowed inbound with
the same domains as those I host?
Use SpamAssassin or similar content inspection.
It's not unusual for legit mail to have different envelope
sender and From: header - email lists rely on this.
And mail with a From: header in your domain is not in itself a
sure indicator of spam. That's why deeper inspection such as
SpamAssassin is useful.
Another issue is that sometimes mail arrives with a broken
From: header. Under certain conditions postfix will add
@yourdomain to these broken headers. This can cause confusion
for your users.
One thing that I've found useful to to set in postfix main.cf
remote_header_rewrite_domain = domain.invalid
so that mail with broken From: headers are clearly labeled as
such. For more info on this, see:
http://www.postfix.org/ADDRESS_REWRITING_README.html#william
-- Noel Jones
