>>> Mcaffee Webshield SMTP, on evaluation the best product for us, but now
>has
>>> some problems if you use it heavily.
>
>> "some problems" like what?
>> It stops working completely and blocks your mail flow?
>> It works but too slowly, with the mail queue getting too long?
>
>My opinion is biased, but I thought I would comment on this.
>
>I installed WebShield SMTP at a site that was running IMail and
>needed virus
>protection. The first problem occurred when an large E-mail (3 megabytes,
>IIRC) was sent to 50 people. The first recipient's mail server was down,
>and WebShield SMTP ended up sending the message to all 50 people each time
>it couldn't reach the first recipient. It wasted about 150 megabytes of
>bandwidth, and annoyed a number of potential customers of the company.
I havn�t seen this. The spool files include all adresses, but the message is send to
them separately.
>Another problem is that it can't be set up properly for anti-relay (like
>most SMTP-based virus scanners). It allows you to restrict relaying to
>certain IPs, but you can't then use SMTP authentication for others. So,
>anyone not on your set of IP addresses who has to send mail gets
>to send out viruses.
That is another problem, you are right.
>Another problem is that anyone can launch a DOS attack by sending E-mail
>addressed to [EMAIL PROTECTED] (note the "." at the end). When you
>do that, the mail keeps getting sent back to the machine (adding a
>"Received:" header each time) until the server slows to a crawl. Since I
>was stupid enough to come up with a workaround (having "yourdomain.com." as
>an alias to "yourdomain.com") when I submitted this to BugTraq, NAI/McAfee
>decided it wasn't worth fixing this security hole.
I did the same thing as you.
>There are a number of other (mostly minor) "gotchas" that keep popping up.
>For example, it doesn't record the IP address of the remote SMTP connection
>in the Received: field yet.
Hermann
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