Before setting the Gmail email alarm, there are several things we should do first:
1. The server of sending emails should support the POP3 protocol. In order to strengthen security and reduce spam, Many mail servers closed this protocol at present. So users need to check if the server support POP3 before choose the mail server, otherwise, the mail can not send successfully.
2. For some mail server using an SSL certificate, it must enable the SSL option, then can send an email
3. Gmail requires additional security settings, we need to log in to your Google account, open to allow less secure apps in the "Sign-in & security" page.
click this link https://myaccount.google.com/security? to set.
4. We recommend you turn off the 2-step verification. But if your Gmail mailbox opened "2-Step Verification", then you need to set up a separate “app
passwords” for camera login. How to set up an "app password" you can click on the "Learn more" to get help.