最后，我得到了解决这个问题的方法。下面是代码，对其他人有帮助
感谢gregsowell博客帮助我完成了这些。https://gregsowell.com/?p=7289

---
- name: Generate an HTML report from jinja template
  hosts: postfix-hosts
  gather_facts: true
  vars:
    #email settings
    email_subject: System status Report
    email_host: stackoverflw.smtp.com
    email_from: noreply@stackoverflw.com
    email_to: AdMin_Stack@stackoverflw.com

    #random settings
    csv_path: /tmp
    csv_filename: report.csv
    headers: Hostname,OS,Distro Ver,Kernel Ver,Postfix Status,FQDN,Total VCPU,Total RAM,Total SWAP,Total Disk,Hyper-V

  tasks:
  - name: Gather last Postfix Status
    ansible.builtin.shell:  systemctl status postfix | egrep -i Active | awk '{ print $2,$3}'
    register: active

  - name: Save CSV headers
    ansible.builtin.lineinfile:
      dest: "{{ csv_path }}/{{ csv_filename }}"
      line: "{{ headers }}"
      create: true
      state: present
    delegate_to: localhost
    run_once: true

  - name: Build out CSV file
    ansible.builtin.lineinfile:
      dest: "{{ csv_path }}/{{ csv_filename }}"
      line: "{{ inventory_hostname }},{{ ansible_distribution }},{{ ansible_distribution_version }},{{ ansible_kernel }},{{ active.stdout }},{{ ansible_fqdn }},{{ ansible_processor_vcpus }},{{ ansible_memtotal_mb }},{{ ansible_swaptotal_mb }},{{ ansible_devices.vda.partitions.vda1.size }},{{ ansible_product_name }}"
      create: true
      state: present
    delegate_to: localhost

  - name: Read in CSV to variable
    community.general.read_csv:
      path: "{{ csv_path }}/{{ csv_filename }}"
    register: csv_file
    delegate_to: localhost
    run_once: true

# - name: debug csv_file

# debug:

# var: csv_file

# run_once: true

  - name: Send Email
    community.general.mail:
      host: "{{ email_host }}"
      from: "{{ email_from }}"
      port: 25
      to: "{{ email_to }}"
      subject: "[Ansible] {{ email_subject }}"
      body: "{{ lookup('template', 'report.html.j2') }}"
      attach: "{{ csv_path }}/{{ csv_filename }}"
      subtype: html
    delegate_to: localhost
    run_once: true

report.html.j2

<table style="border: 1px solid black; border-collapse: collapse;">
<tr>
    {% for header in headers.split(",") %}
    <th style="border: 1px solid black; padding: 8px 16px;">{{ header }}</th>
    {% endfor %}
</tr>
{% for host in csv_file.list %}
<tr>
    {% for header in headers.split(",") %}
    <td style="border: 1px solid black; padding: 8px 16px;">{{ host[header] }}</td>
    {% endfor %}
</tr>
{% endfor %}
</table>