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Re: Private IPs in Received Path email headers

On Fri, Jun 09, 2006 at 09:55:51PM +0200, Andrew Miehs wrote:
> Up until now, I have not been striping received headers in my sent  
> emails (The ones from work) so in the path you will see some internal  
> IP addresses. Does any 'anti-spam' software check these headers, and  
> try and do reverse lookups on them?

I know that spamassassin will assign scores based on where the mail
has been through, so yes, reverse lookups amongst other things.

> Then marking them as SPAM as it  can't look  up the original
> address?

I am not aware of any antispam software that would increase the spam
score based on the mail being relayed through an intermediary hop
with no reverse DNS or that was RFC1918 private IPs.  I  don't see
how that would be indicative of spam.

> I am using Postfix, and I could strip them with a 'header_checks',  
> but I would rather not mess with the message headers if I can avoid  
> it _messy_ ....

I think you would be fine to leave it as it is.


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