You had better use gmail, not yahoo or hotmail.

Please make sure DVR or NVR has connected to router and Internet successfully. You can judge by picture below. If it always keeps disconnected, please click here to get some help:

https://hview.kf5.com/hc/kb/article/1032100/?from=draft

2. Please enable alarm and email alerts function.

3. Please log in your gmail account.

4. Please open website below:

http://www.google.com/settings/security/lesssecureapps

5. Please tick turn on.

6. Please set up email in DVR setting like picture below. If mail test succeeds, it is working.

smtp server is smtp.gmail.com

port is 465

tick SSL

user name is your gmail account

password is your gmail account password

sender is your gmail account

receiver can be any email.