Few days ago I bought a DCS-5222L Ip Camera…..
I can’t send any e-mail messages from the camera.
My SMTP settings on the ‘Snapshot’ configuration page:
SMTP Mail Server: smtp.gmail.com
Port: 465
Username: DlinkCamera
Password: <My gmail email psw>
Sender E-mail Address: <My gmail email address>
Use SSL-TLS: SSL-TLS
Pushing the ‘test’ button
always results in the error message “Send a test mail failure”! 
An extract from the error log (normal operation):
2012-12-28 21:09:00 Recording 20121228_210839.avi by Motion Detection to SD Card is OK.
2012-12-28 21:09:02 Video Clip 20121228_210839.avi by Motion Detection to FTP is OK.
2012-12-28 21:09:07 Digital Output(1) is activated.
2012-12-28 21:09:10 6 Snapshots by Motion Detection to E-mail is failed. 
2012-12-28 21:09:16 Digital Output(1) is deactivated.
Using exactly the same settings for D-ViewCam on my Windows7 PC and on my NAS are just working fine!!
Who can help me please?