blacklisting local domain?

Julian Field MailScanner at
Tue Jan 13 19:15:32 GMT 2009

On 13/1/09 18:18, Alex Neuman van der Hans wrote:
> 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.
That won't work as it will check the envelope sender, he wanted to check 
the From: header.
Nice try though :-)


> 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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Julian Field MEng CITP CEng
Buy the MailScanner book at

MailScanner customisation, or any advanced system administration help?
Contact me at Jules at Jules.FM

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