SMTP behind NAT

[Georg Pichler <georg.pichler () gmail com>]

Hi Guys.

I'm currently in a nat environment, where outbound connections to smtp and 
smtps are blocked by a firewall. You are therefore forced (unless using vpn or 
something alike) to send mail via a local smtp server. I was wondering whether 
there is any sense in blocking these connections.
What does the administrator gain by forcing everybody to a local open smtp 
server? Can you avoid being put on some kind of blacklist by these means?

I would very much appreciate an answer. Thanks in advance.

Best regards,
Georg Pichler

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