Check if valid user before scanning

[Ken A]

With sendmail, when you don't have a local password file or ldap handy,
you can use the access map feature to explicitly allow relaying TO your
users and reject with 550 by default all others, like so:

TO:user1 at domain.com    RELAY
TO:user2 at domain.com    RELAY
# Default entry to reject
TO:domain.com  ERROR:5.1.1:550 User unknown

Ken A
Pacific.Net

John Hinton wrote:

> My mailserver is getting pounded with mail sent to invalid usernames at our
> hosted domains. Today, there have been about 1200 viruses sent so far, of
> which only about 20% were to real mail accounts. Is there a way to allow the
> checking of a valid username before scanning begins? If the account doesn't
> exist bounce or dump it, but for sure not use the resources.
>
> I'm using RHEL 3.0 and sendmail and have procmail running as well. Using
> ClamAV as the AV package running as a deamon. This thing takes a bit of
> horsepower! Looking for ways to stop the waste of processor power on the trash.
>
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