Questions about email notifications: new user registration and others

Hello, excuse me for my bad English, I have some doubts and problems with sending e-mail notifications, I hope you can help:

1. When a user registers, the user should receive an email with the information of his username and password. However, I have been testing with several emails (Hotmail, Gmail, etc) and never gets this mail.

2. I have activated the BCC notifications for when a new user registers. Indeed, when someone signs up, the admin copy arrives to mail administrator, but does not arrive at the mail of the user. And if I turn off the BCC notification for the administrator , then the mail does arrive to the user. This should not happen, this mail with registration info should arrive out to both (user and administrator) mail.

when a user posts a list, this notification email does arrives only to administrator, not to user, if e-mails user is different that gmail (I tested and have problems with hotmail, outlock, yahoo, etc)

3. These options are only for mail site administrator wordpress ?? What should I do if I want these BCC copy admin mails, reach other emails from other users with administrator role?

I’m not sure if it influences the fact that the website has an SSL certificate installed. I have the latest version of the plugin installed, and add-ons. I have WP 4.4.2.
Thanks, great plugin