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Home > System Security > Open Relay Prevention

Introduction: An ISP's worst nightmare, a user running their own email server which was left unlocked, allowing spammers to send out huuuge amounts of spam, using up resourses and generally causing problems.

Use these sites, to make sure you lock down your email server!

 

Client Based Firewalls
Name: open_relay_faq
Description: One of the best FAQ's for simply explaining what open relays are and why they're a problem.
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Name: Blocking relaying in Exchange
Description: Microsoft's own page about controlling SMTP Relaying, when using Microsoft Exchange
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Name: Open Relay Fix
Description: how to secure your current mail system against third-party relay
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Name: FormMail Replacement
Description: nms is an attempt to provide replacements for all of the scripts from Matt's Script Archive. MSA is probably the most well-known archive of CGI programs currently available on the web
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Name: Matt's FormMail Issues
Description: Any users who have versions of FormMail prior to v1.91, including the popular version 1.6, should upgrade immediately
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Name: FormMail Issues
Description: All the information you need regarding Matt's form mail problems
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