while(head)
{
    email_t* currentEmail = head->emailHead;

    while(currentEmail != NULL){
        if(strstr(currentEmail->emailAddress, search))
        {
            id = head->ID;
            printf("Znaleziono w ID = %d \n", id);
            return id;
        }
        currentEmail = currentEmail->next;
    }

    head = head->next;
}