On Thu, Oct 10, 2002 at 01:30:07PM -0700, Daniel Goldin wrote:
> Here is what earthlink sent me:
> 
> 
>       *   The mail server used to send your e-mail has been 
>           confirmed to be vulnerable to third party relay.   For 

Unlikely, since you've installed sendmail from 7.3 and relaying is
disallowed by default.  

>       *   Your e-mail attempted to pass directly from a dynamically 
>           assigned IP range (such as dialup, cable, or DSL) to the
>           EarthLink network (known as "direct to MX") 
>           without first routing through the appropriate SMTP 
>           server.  Please visit:

VERY likely since sendmail is smart enough to deliver mail directly.  A
good fix for this would be to use sendmail's SMART_HOST feature.  For my
own ISP, I've got the following in /etc/mail/sendmail.mc:

define(`SMART_HOST',`smtp:mail.attbi.com')dnl

You'll need to define Earthlink's SMTP mailer here.  Once you've edited
sendmail.mc (and make a BACKUP before you start!!!), do the following:

# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
# service sendmail restart

When you've done this, you've basically told sendmail to redirect all
its e-mail to EL's SMTP server.  From there, it will be delivered to its
final destination.  This isn't so bad - any redeliveries happen
automatically after they've left your system.  I've run into cases
myself where braindead mailers have rejected e-mail coming from my
system, but when I switched to using a smart host, those issues went
away.

Your users won't notice any change except maybe in the bounce messages.
If you spell a domain name wrong (say .cmo instead of .com), you'll get
a bounce message from EL, not from your own sendmail.

-- 
Ed Wilts, Mounds View, MN, USA
mailto:[EMAIL PROTECTED]
Member #1, Red Hat Community Ambassador Program



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