From 24cf567d9a6865b4838035723da3fee66a3c5595 Mon Sep 17 00:00:00 2001
From: ayo <ayo@ayoinc.test>
Date: Fri, 12 Jun 2026 10:06:53 +0200
Subject: [PATCH] Initial: stack mail Postfix + Dovecot sur Alpine

---
 .gitignore           |  2 ++
 dovecot/Dockerfile   | 22 ++++++++++++++++++++++
 dovecot/dovecot.conf | 29 +++++++++++++++++++++++++++++
 dovecot/users        |  2 ++
 postfix/Dockerfile   | 43 +++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 98 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 dovecot/Dockerfile
 create mode 100644 dovecot/dovecot.conf
 create mode 100644 dovecot/users
 create mode 100644 postfix/Dockerfile

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7d21963
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+vmail/
+*.log
diff --git a/dovecot/Dockerfile b/dovecot/Dockerfile
new file mode 100644
index 0000000..9a3c7e6
--- /dev/null
+++ b/dovecot/Dockerfile
@@ -0,0 +1,22 @@
+# Image de base Alpine
+FROM alpine:3.21
+
+# Installer Dovecot (IMAP/POP3) + le module d'authentification
+RUN apk add --no-cache dovecot
+
+# --- Utilisateur vmail identique à celui de Postfix (uid/gid 5000) ---
+RUN (deluser vmail 2>/dev/null || true) \
+    && (delgroup vmail 2>/dev/null || true) \
+    && addgroup -g 5000 vmail \
+    && adduser -D -u 5000 -G vmail -h /var/mail/vhosts vmail \
+    && mkdir -p /var/mail/vhosts
+
+# --- Copier nos fichiers de config dans l'image ---
+COPY dovecot.conf /etc/dovecot/dovecot.conf
+COPY users /etc/dovecot/users
+
+# Exposer les ports IMAP
+EXPOSE 143 993
+
+# Lancer Dovecot au premier plan
+CMD ["dovecot", "-F"]
diff --git a/dovecot/dovecot.conf b/dovecot/dovecot.conf
new file mode 100644
index 0000000..146000a
--- /dev/null
+++ b/dovecot/dovecot.conf
@@ -0,0 +1,29 @@
+# Protocoles servis
+protocols = imap
+
+# Écouter sur toutes les interfaces
+listen = *
+
+# --- Emplacement des boîtes : le même Maildir que Postfix ---
+mail_location = maildir:/var/mail/vhosts/%d/%n
+# %d = domaine (ayoinc.test), %n = partie locale (alice, bob)
+
+# --- Authentification ---
+disable_plaintext_auth = no
+auth_mechanisms = plain login
+
+# Base d'utilisateurs : un fichier passwd-file
+passdb {
+  driver = passwd-file
+  args = scheme=PLAIN username_format=%u /etc/dovecot/users
+}
+userdb {
+  driver = static
+  args = uid=5000 gid=5000 home=/var/mail/vhosts/%d/%n
+}
+
+# Désactiver SSL pour l'instant (on l'ajoutera proprement après)
+ssl = no
+
+# Logs vers la sortie standard (pratique pour podman logs)
+log_path = /dev/stderr
diff --git a/dovecot/users b/dovecot/users
new file mode 100644
index 0000000..15f6820
--- /dev/null
+++ b/dovecot/users
@@ -0,0 +1,2 @@
+alice@ayoinc.test:{PLAIN}alice
+bob@ayoinc.test:{PLAIN}bob
diff --git a/postfix/Dockerfile b/postfix/Dockerfile
new file mode 100644
index 0000000..c5ad728
--- /dev/null
+++ b/postfix/Dockerfile
@@ -0,0 +1,43 @@
+# Image de base Alpine, légère
+FROM alpine:3.21
+
+# Installer Postfix et les outils
+RUN apk add --no-cache postfix postfix-pcre rsyslog
+
+# --- Utilisateur dédié au stockage des mails virtuels ---
+# Tous les mails appartiendront à cet utilisateur "vmail" (uid/gid 5000)
+# Supprimer le vmail créé par défaut par Postfix, puis recréer le nôtre en uid/gid 5000
+RUN (deluser vmail 2>/dev/null || true) \
+    && (delgroup vmail 2>/dev/null || true) \
+    && addgroup -g 5000 vmail \
+    && adduser -D -u 5000 -G vmail -h /var/mail/vhosts vmail \
+    && mkdir -p /var/mail/vhosts/ayoinc.test \
+    && chown -R vmail:vmail /var/mail/vhosts
+# --- Configuration Postfix de base ---
+RUN postconf -e "myhostname = mail.ayoinc.test" \
+    && postconf -e "mydomain = ayoinc.test" \
+    && postconf -e "myorigin = \$mydomain" \
+    # Postfix ne gère PAS lui-même notre domaine en "local" : c'est du virtuel
+    && postconf -e "mydestination = localhost" \
+    && postconf -e "inet_interfaces = all" \
+    && postconf -e "inet_protocols = ipv4"
+
+# --- Configuration des boîtes virtuelles ---
+RUN postconf -e "virtual_mailbox_domains = ayoinc.test" \
+    && postconf -e "virtual_mailbox_base = /var/mail/vhosts" \
+    && postconf -e "virtual_mailbox_maps = lmdb:/etc/postfix/vmailbox" \
+    && postconf -e "virtual_minimum_uid = 5000" \
+    && postconf -e "virtual_uid_maps = static:5000" \
+    && postconf -e "virtual_gid_maps = static:5000"
+
+# --- Déclaration des comptes virtuels (alice & bob) ---
+# Chaque ligne : adresse -> chemin Maildir (le / final = format Maildir)
+RUN echo "alice@ayoinc.test    ayoinc.test/alice/" >  /etc/postfix/vmailbox \
+    && echo "bob@ayoinc.test      ayoinc.test/bob/"   >> /etc/postfix/vmailbox \
+    && postmap lmdb:/etc/postfix/vmailbox
+
+# Exposer le port SMTP
+EXPOSE 25
+
+# Lancer Postfix au premier plan
+CMD ["postfix", "start-fg"]