installing libmilter

[Stephen Swaney]

> -----Original Message-----
> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of Anders Andersson, IT
> Sent: Friday, November 11, 2005 8:44 AM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: installing libmilter
> 
> > -----Original Message-----
> > From: MailScanner mailing list
> > [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Stephen Swaney
> > > -----Original Message-----
> > > From: MailScanner mailing list
> > [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> > > Behalf Of Anders Andersson, IT
> > > Sent: Thursday, November 03, 2005 7:04 AM
> > > To: MAILSCANNER at JISCMAIL.AC.UK
> > > Subject: OT: installing libmilter
> > >
> > > Hi all pro's  :)
> > >
> > > Could somone shed some light how to do the libmilter
> > installation on
> > > CentOS.
> > > I managed to figure out I need the source to build the libmilter
> > > included in the package
> > >
> > http://mirror.nsc.liu.se/CentOS/4.2/os/SRPMS/sendmail-8.13.1-2.src.rpm
> > > before I can do the rest but Im not sure how to actually do the
> > > libmilter/sendmail rebuild thingy.
> > >
> > > If this is something someone like me should not do pls
> > informa and Ill
> > > drop it until I actually know what Im doing
> > >
> > > Never even tried to rebuild sendmail since I only use out
> > of the box
> > > with some changes in sendmail.mc so go easy on a hardcore newbie  :)
> > >
> > > /Anders
> >
> > You shouldn't need to build libmilter. Just install the
> > sendmail-devel rpm.
> > Then read /usr/share/doc/sendmail/README.libmilter for the
> > gory details.
> >
> > Most milters are fairly easy to install. Some general instructions:
> >
> > 1. Download and unpack the milter source code 2. Configure
> > build and install the milter 3. Install the init script so
> > the milter can start on reboot (some milters do this automatically).
> > 4. Start and test the milter (look at the mail logs for
> > error) 5. Configure the init script to run at boot 6. Modify
> > your sendmail.mc file to configure sendmail to user the milter.
> >    Typically it's just adding a line similar to:
> >
> > 	INPUT_MAIL_FILTER(`milter-greylist',
> > `S=local:/var/milter-greylist/milter-greylist.sock')
> > 7. Use m4 to rebuild your sendmail.cf file from your modified
> > sendmail.mc file 8. Restart sendmail (don't forget to check
> > the mail log for errors)
> >
> > Hope this helps,
> >
> > Steve
> >
> Turn out to just as simple as you said, damn I hate when I cant figure
> things out my self :)
> All is running fine and guess I will have to give at week to see what
> the result will be regarding decreased mailflow. The only thing I didnt
> like is the response sent back to the sender, it contains a little to
> much info
> Ex.
> Remote MTA ns2.ltkalmar.se: SMTP diagnostic: 550 5.7.1
> <testarmailenpajobbet at ltkalmar.se>... server [172.29.32.81] for
> <testarmailenpajobbet at ltkalmar.se> rejected address saying "User
> unknown"
> 
> I rather just having it saying "550 5.7.1 User unknown" but I can live
> with this for the moment :)
> 

That's an interesting point and I'll pass your comment along to Anthony
Howe. A quiet or less verbose switch might be useful. 

In reviewing the milter-ahead documentation I found two useful switches that
I had missed before :) I'll pass them along as you might find them useful:

-R
    Reject a RCPT if it uses a routed address (the %-hack).

-B
    For a backup-MX, reject mail when the primary MX is available. This does
not conform with RFC 974 "MAIL ROUTING AND THE DOMAIN SYSTEM" section
"Interpreting the List of MX RRs", paragraph 7, sentence 2 and 3, which only
requires mail clients to attempt delivery to the primary first, before
trying other MXes. Spammers often attempt to by-pass spam filters by sending
email directly to secondary MX machines, which often have weaker
requirements. This option essentially demands that a client only deliver to
the primary MX when it is available.

The full documentation and other useful milters can be found at:
	
	http://www.snertsoft.com/
 
Steve

Stephen Swaney
Fort Systems Ltd.
stephen.swaney at fsl.com
www.fsl.com

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