Stop Password and Email Change Confirmations

Stops WordPress from emailing users when their password or email address is changed, for example during bulk imports.

Code

add_filter( 'send_password_change_email', '__return_false' );
add_filter( 'send_email_change_email', '__return_false' );

These emails alert users to account takeovers. Consider enabling the snippet only while importing.

Install WPIDE on your WordPress site (it is free) and open Code Snippets.
Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
It is added inactive: review the code and settings, then switch it on.