On Sun, 9 Jun 2002, Cory Daehn wrote:
> Well, the reason for using the RCPT callback is because a lot of
> spammers use false addresses in the from: line... Some even use domains
Well, ones that use invalid domains is easy.. for exim 3
"senver_verify", for exim 4, appropriate entries in an ACL.
> that don't exist. Much less invalid users. Even a later bounce would
> cut the spam by 50% or more.
You cant detect a 'later bounce' at SMTP time.
As far as doing callbacks, no, it is *not* the default behaviour, since
on a very busy mailhub, it could easily slow the server down to
unusability. You need to speciically enable callbacks. In Exim 3, there
is a global config option. In exim 4, you need to specifically code what
you want in an ACL..
>
> -----Original Message-----
> From: exim-users-admin@??? [mailto:exim-users-admin@exim.org] On
> Behalf Of Suresh Ramasubramanian
> Sent: Sunday, June 09, 2002 7:14 AM
> To: Cory Daehn; exim-users@???
> Subject: Re: [Exim] Spam and RCPT verification...
>
>
> +++ Cory Daehn <Sunday 09 June 2002 08:05 pm>:
> > Isn't exim setup by default to open an SMTP connection for the mail
> > server of the domain in the FROM: address of e-mails and verify that
> > the user exists?
>
> Look at Callbacks. And remember that several situations (like a mailhub
> setup, or by default in certain mailservers) the mailserver might accept
> EVERYTHING you throw at it with 250 ok and generate the bounce
> afterwards.
>
> -srs
>
> --
> Suresh Ramasubramanian <----> mallet <at> efn dot org
> EMail Sturmbannfuhrer, Lower Middle Class Unix Sysadmin
> [Linux One Stanza Tip] From : <bish@???>
> LOST #063 -**< Sub : Default Console Font >**-
> Do you long for a change of the default font at boot up ? Look at the
> kbd fonts in /usr/lib/kbd/consolefonts installed by the "kbd" package".
> man setfont for details ... You may prefer to include the line in
> your.bashrc ... Try : $setfont /usr/lib/kbd/consolefonts/b.fnt.gz
>
> --
>
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>
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>
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