Register users without password by email

Hello!
I need some help.
Because lately, because the host company (from what it seems) I have problems sending mails to new users registered somehow know a plugin or a code which users can register on site (wordpress form) which not to require confirmation from the mail? Something like, ask the user to: username, email (without confirmation) and password that and it automatically set from the beginning. I hope I made myself understood.
Thank you!