On 16-Oct-2009, at 13:31, Matt Friedman wrote:
For an internet facing postfix server, is TLS strictly required?

Of course not.

Do I need to obtain an SSL certificate for this?

You can, but you can also use a self-signed cert.

What would happen if I didn't use TLS? Would I be inviting spammers
and hackers to take over my postfix installation? Are there
alternative security measures that are as secure or better?

The advantages of TLS don't have all that much to do with spam per se.

--
We all need help with our feelings. Otherwise, we bottle them up,
        and before you know it powerful laxatives are involved.

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