blacklisting local domain?

Alex Neuman van der Hans alex at
Tue Jan 13 18:18:38 GMT 2009

It is, but it's better to do at the MTA stage with SPF and mta rules  
than it is to do it at mailscanner.

Otherwise you'd have to do something like:

From:	*	and		From:		no
From:	*	and		From:		no
From:	*	and		From:	no
From:	*		yes

in your spam.blacklists.rules file. I guess.

On Jan 13, 2009, at 12:58 PM, Michael Masse wrote:

> Is there any way MailScanner can blacklist email that says it's from  
> my domain, but comes from an IP outside of my ipspace?   We force  
> all of our clients to use our specific smtp server.
> We've been getting hit very hard with these self addressed spams  
> lately and MailScanner has been doing a fantastic job of tagging  
> these as spam, but the problem is that even though our commercial  
> email system accepts spamassassin header tags to put them in the  
> appropriate junk folder automatically, it ignores the headers if it  
> thinks the sender is oneself and then I get complaints about these  
> spams getting through.
> The real solution is obviously for the commercial vendor to fix this  
> problem and trust spamassassin all the time, but this has been going  
> on for years and they aren't going to change it any time soon, so  
> I'm stuck with getting rid of these messages at the SMTP/Mailscanner  
> stage before they get passed on to the rest of the mail system.     
> I've implemented mailfromd which allows me to automatically reject  
> any email that uses our domain as a sending domain and doesn't come  
> from within our ip space at the SMTP negotiation envelope level and  
> this is blocking 99% of them, but there are a few that are still  
> sneaking through because they use some other domain at the smtp  
> "mail from:" envelope stage which allows them to bypass mailfromd,  
> but then in the data portion of the email they use our domain in  
> the  from: address in the header which then confuses our email  
> system into ignoring the spamassassin header tag again.
> As I said, MailScanner/Spamassassin is properly tagging these emails  
> as spam, but the tags get ignored by an oversight on our mail  
> system.  We force all of our clients to use our own smtp server, so  
> there should never be a case of an email with a sender address of  
> our domain coming from outside of our domain.    Is it possible for  
> MailScanner to blacklist these?
> -Mike
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