How to let ansible answer "yes" to everything sendmailconfig asks

Just use the yes shell utility,

yes 'y' | <command-name>#    ^^The repeated string being 'yes' as the OP had asked.

From the man page,

NAME       yes - output a string repeatedly until killedSYNOPSIS       yes [STRING]...       yes OPTIONDESCRIPTION       Repeatedly output a line with all specified STRING(s), or 'y'.

Basically, you would need to perform two tasks: update hosts and run sendmailconfig.Note: If you are running Ansible 2.5.0 you might need to install the pexpect module on the remote host, so include this task into your tasks file. For example:

- name: Update hosts  lineinfile:    path: /etc/hosts    regexp: '^127\.0\.0\.1'    line: '127.0.0.1 localhost   {{ ansible_host }}'    owner: root    group: root    mode: 0644- name: Install pexpect module  raw: sudo apt-get -y install python-pexpect- name: Configure sendmail  expect:    command: sendmailconfig    responses:      Question:        - Configure sendmail with the existing /etc/mail/sendmail.conf? [Y]: y        - Configure sendmail with the existing /etc/mail/sendmail.mc? [Y]: y        - Reload the running sendmail now with the new configuration? [Y]: y    timeout: 30