membership new account notification is not sent to administrator

Dear friends,

there is no notification email sent to administrator after new member registration.

I use standard WP site, membership plugin 2.1.2 , Change WP Mail From Details plugin 1.0 .

(There is no problem for my other WP Multisite with very similar configuration and the same webhosting provider GoDaddy.

I have the exact problem also with Gravity Forms administrator notification after a form is saved. Standard WP does not work and WP Multisite works well.)

Where can be a problem?

Thanks a lot,

Martin