Setting DCS950 IP camera

[suvenirana]

Please, can anyone help me:

1. How can we make cameras to be seen in internet?
Hardware: 2 x DCS 950, a SpeedTouch router, 2.5Mb ADSL, AMD XP2600/1GB/80GB, a DynDNS address.
What router need to function properly?
We can connect to the router by ddns address but we can't see the cameras, even when we change port to what ever (81, 82...).

2. We need this cameras in the store for night surveillance/motion detection.
But we don't have a smtp account so we tried to use either yahoo or gmail. Both failed on test. We suppose that is happend because it is need a SSL connection and DCS950 does not have that option. Do you know, by any chance, a free smtp host who can work with DCS950?

Since D-Link View software failed also connecting to yahoo/gmail, now we use D-Link View with software smtp server and all it's OK. But in this way we are forced to keep our computer running 24 hour.

Thank you!