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Email encryption

Are emails by default encrypted? From my outlook client (2003) in our 2003 exchange setup if I email out some data to an external mailbox, say my hotmail mailbox, is this traffic encrypted, in any way, or just plain text? And vice versa, from home on a hotmail mailbox into a corporate exchange mailbox, is this encrypted?

How about internal to internal traffic, i.e. from one corporate  mailbox to another, does that ever traverse the "outside" or is it always internal traffic?
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pma111
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pma111
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2 Solutions
 
BusbarCommented:
it is plain text. internally in Exchange 2010 it is encrypted, older versions it is not.
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The_KirschiCommented:
I second busbar. Also, if you have only one server the traffic will stay internally on the machine and not go outside.
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pma111Author Commented:
what iabout cases where there are more than one exchange server?

Would someone purposelly have to sniff mail traffic somewhere on the network permieter if they were targetting us? What is the likelehood of mail being sniffed at random?
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The_KirschiCommented:
Like busbar said, if you have Exchange 2003 then no encryption occurs between the servers. So everyone - with the required knowledge - could read your network traffic between the mail servers internally. Same goes for external email.

The likelihood of sniffing is hard to tell I think. I recommend you talk internally with the required persons, maybe CEO, which data is critical for your company - e. g. programming code if you are a developer shop - and send this out only encrypted through some third party software/device.

Not sure if this helps answering your questions.
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BusbarCommented:
the sniffing parts can be protected by the network layer and of course encryption, I am doing Exchange for 10 years never heard someone sniffed SMTP traffic.
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The_KirschiCommented:
@busbar: I also did not hear that someone did SMTP sniffing but are you sure you will notice if someone is sniffing your network traffic?
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