add ansible roles

smtp_nextcloud/handlers/main.yml

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+- name: Reload postfix
+  service:
+    name: postfix
+    state: reloaded

smtp_nextcloud/tasks/main.yml

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+---
+- name: Perform a dist-upgrade.
+  ansible.builtin.apt:
+    upgrade: dist
+    update_cache: yes
+
+- name: Set mailname
+  template:
+    src: templates/mailname
+    dest: /etc/mailname
+
+- name: Install postfix
+  package:
+    name:
+      - postfix
+      - mailutils
+    state: present
+
+- name: Copy the config file
+  template:
+    src: templates/main.cf
+    dest: /etc/postfix/main.cf
+  notify: Reload postfix

smtp_nextcloud/templates/header_check

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+/From:.*/ REPLACE From: Nextcloud <nextcloud@{{ hostname }}.{{ domain_base }}>

smtp_nextcloud/templates/mailname

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+{{ hostname }}.{{ domain_base }}

smtp_nextcloud/templates/main.cf

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+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+myorigin = /etc/mailname
+myhostname = {{ hostname }}.{{ domain_base }}
+recipient_delimiter = +
+inet_interfaces = all
+inet_protocols = all
+
+smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
+# fresh installs.
+compatibility_level = 3.6
+
+# TLS parameters
+smtp_tls_CApath=/etc/ssl/certs
+smtp_tls_security_level=may
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+mydestination = localhost
+relayhost =
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+mailbox_size_limit = 0
+
+## Enforce correct sender address
+sender_canonical_classes = envelope_sender, header_sender
+sender_canonical_maps = regexp:/etc/postfix/sender_canonical
+smtp_header_checks = regexp:/etc/postfix/header_check

smtp_nextcloud/templates/sender_canonical

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+/.+/    nextcloud@{{ hostname }}.{{ domain_base }}