Rules with IP addresses

Julian Field MailScanner at ecs.soton.ac.uk
Tue Sep 2 13:47:35 IST 2008



Caza Henha wrote:
> Hi Jules,
>  
> I considered that transport maps in postfix was not the general case 
> and was not suggesting that it is somthing that should be worked into 
> the product, not unless it was specifically warranted. I will look 
> into the CustomFunctions as i do know a bit of Perl and sorry you did 
> answer the question initially, just my eyes not working so good 
> sitting at a screen all day...Just as a quick question though, does 
> and ammendment to a ruleset require a restart of MailScanner?
No, just a "service MailScanner reload" or send a HUP to the master 
MailScanner process, at which point all the children will commit suicide 
and be re-spawned by the master.
>  
> Regards
>  
> Caza
>
> > Date: Tue, 2 Sep 2008 09:00:33 +0100
> > From: MailScanner at ecs.soton.ac.uk
> > To: mailscanner at lists.mailscanner.info
> > Subject: Re: Rules with IP addresses
> >
> >
> >
> > Caza Henha wrote:
> > > Hi Jules,
> > >
> > > Thanks for the answer, I presumed that would be the case, but I was
> > > thinking that as our postfix configuration has transport maps it does
> > > actually know before sending the mail to our application server what
> > > the destination IP address is.
> > But that is not the general case, and I'm certainly not going to start
> > processing entire Postfix configurations in an attempt to work it out.
> > Sorry :(
> > > Does this mean then that something like the following would be 
> necessary:
> > >
> > > To: support at example.com <mailto:support at example.com> store
> > > //Ticketing server
> > > To: issues at example.com <mailto:issues at example.com> store
> > > //Ticketing server
> > > ....
> > > To: application1 at example.com <mailto:application1 at example.com>
> > > delete //App Server 1
> > > To: application2 at example.com <mailto:application2 at example.com>
> > > store //App Server 2
> > > ...
> > > To: user at example.com <mailto:user at example.com> delete
> > > //Exchange server
> > > To: user at example.com <mailto:user at example.com> delete
> > > //Exchange server
> > > .....
> > > FromOrTo: default deliver //Public Mail server
> > >
> > > Bearing in mind that there are 1000s of different email address
> > > permutations going to the app servers (writing a script to create the
> > > rules is easy) would there be any performance problems with
> > > Mailscanner reading these files?
> > I wouldn't advise more than 1000 or so rules in a ruleset file. For
> > anything bigger than that use a Custom Function. I suspect yours could
> > be written as a Custom Function quite easily. Take a look in
> > /usr/lib/MailScanner/MailScanner/CustomFunctions/*.pm and you'll see 
> how
> > to do it. Not hard if you know a bit of Perl.
> > > Also when using an IP address in the "From" could you direct me to
> > > information from the question below:
> > >
> > > > > Consequently I have noticed a number of examples have IP 
> addresses in
> > > > > the From section of the rules and I was just wondering where 
> this IP
> > > > > address was coming from and what it can actually be as I 
> cannot seem
> > > > > to find any documentation on it. For example is this IP 
> address (or
> > > > > the RegEx of one) the connecting smtp server (or any smtp 
> server that
> > > > > the mail has passed through), client address, MX address of the
> > > > > sending domain etc or any combination of all the previous?
> > I answered that in my previous mail, I believe. Here it is again
> > copy-and-pasted from the quote below:
> >
> > > It is the IP address of the machine that was the client end of the 
> SMTP
> > > connection to the server. So in the case of a customer-facing SMTP
> > > server, it will be the customer's client IP address. In the case of an
> > > MX it would be the IP address of the SMTP server talking to you.
> > >
> > > > Date: Mon, 1 Sep 2008 12:22:45 +0100
> > > > From: MailScanner at ecs.soton.ac.uk
> > > > To: mailscanner at lists.mailscanner.info
> > > > Subject: Re: Rules with IP addresses
> > > >
> > > >
> > > >
> > > > Caza Henha wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > I have recently installed Mailscanner with Postfix and 
> MailWatch and
> > > > > it seems over the last week the system is running great, 
> however I am
> > > > > now getting requests to tweak the default rules that I have from
> > > > > various users in different departments. I have been trying to 
> delve
> > > > > into the knitty gritty of the rules and understand the 
> principles and
> > > > > they do not seem very complicated and when looking at some
> > > examples on
> > > > > the Wiki things shouldn't be to difficult.
> > > > >
> > > > > Consequently I have noticed a number of examples have IP 
> addresses in
> > > > > the From section of the rules and I was just wondering where 
> this IP
> > > > > address was coming from and what it can actually be as I 
> cannot seem
> > > > > to find any documentation on it. For example is this IP 
> address (or
> > > > > the RegEx of one) the connecting smtp server (or any smtp 
> server that
> > > > > the mail has passed through), client address, MX address of the
> > > > > sending domain etc or any combination of all the previous?
> > > > It is the IP address of the machine that was the client end of 
> the SMTP
> > > > connection to the server. So in the case of a customer-facing SMTP
> > > > server, it will be the customer's client IP address. In the case 
> of an
> > > > MX it would be the IP address of the SMTP server talking to you.
> > > > >
> > > > > Also can this be used in a "To" configuration,
> > > > No. Due to the way mail delivery works, you don't know the IP
> > > address of
> > > > the destination until you have already started sending the message.
> > > > Can't be done.
> > > >
> > > > Jules
> > > >
> > > > --
> > > > Julian Field MEng CITP CEng
> > > > www.MailScanner.info
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> >
> > Jules
> >
> > --
> > Julian Field MEng CITP CEng
> > www.MailScanner.info
> > Buy the MailScanner book at www.MailScanner.info/store
> >
> > Need help customising MailScanner?
> > Contact me!
> > Need help fixing or optimising your systems?
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Jules

-- 
Julian Field MEng CITP CEng
www.MailScanner.info
Buy the MailScanner book at www.MailScanner.info/store

Need help customising MailScanner?
Contact me!
Need help fixing or optimising your systems?
Contact me!
Need help getting you started solving new requirements from your boss?
Contact me!

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