Block spam from web server

"Hoo Kok Mun" <[email protected]>
Newsgroups gmane.user-groups.linux.singapore
Message-ID <d8f9514568324a01d5d7627095fb32d4.squirrel@webmail.mail01.commz.com.sg>
Hi,

On my mail log, I found the statement below.

X-Authentication-Warning: s69819.random.com: apache set sender to
[email protected] using -f

Someone was trying to send spam/relay email via my web server.
Sendmail treated as if it came from apache@localhost.
It never go through the SMTP AUTH process and send out spam/relay email.

Info that may help.
Distribution - Slackware v12.2
sendmail v8.14.3 (with SMTP AUTH)
httpd v2.2.15
php v5.2.12
horde webmail v1.2.1
squirrelmail v1.4.20

Question:
How can I enable webmail but stop the spam/relay?

Appreciate any help or direction to solve this issue.

Thanks.







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