Securing e-mail

You can use firewalls, restrict relays and connections, and filter out viruses to help secure e-mail.

It is important to promote a secure environment in your Simple Mail Transfer Protocol (SMTP) server. You must protect your SMTP server and your users from internal and external hindrances.

• Sending e-mail through a router or firewall
  An e-mail router is an intermediate system that Simple Message Transfer Protocol (SMTP) delivers mail to when it cannot locate the recipient's exact IP address.

• Restricting relays
  To prevent people from using your e-mail server for spamming or sending large amounts of bulk e-mail, you can use the relay restriction function to specify as closely as possible who can use your system for relays.

• Restricting connections
  To ensure the security of your system, you need to prevent the connection of users who might abuse your e-mail server.

• Filtering e-mail to prevent virus proliferation
  To prevent the spread of a virus that might infiltrate the e-mail servers, you can create filters to look for a particular subject, type, file name, and originator's address in incoming e-mail. The e-mail can then be quarantined or discarded.

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