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feat(mail): 支持 SMTP Submission 由 API 接管

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- 新增 `465/587` 提交服务与 TLS 配置，支持 StartTLS 和隐式 TLS。
- 提交时校验认证邮箱、权限和 `From` 一致性，先写入 `Sent` 再转发到后端 SMTP。
- 增加 `Message-ID` 去重与失败回滚，避免重复保存发送副本。
- 调整部署与文档，移除 Postfix 的 submission 监听，改由 LanQin API 对外提供提交端口。
This commit is contained in:
LanQin_
2026-06-24 10:47:16 +08:00
parent f2457c63ee
commit fa450c9f9b
17 changed files with 792 additions and 28 deletions
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deploy/postfix/main.cf
+4 -6
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@@ -14,13 +14,11 @@ virtual_transport = lmtp:inet:dovecot:24
virtual_mailbox_base = /var/mail/vhosts
smtpd_banner = $myhostname ESMTP LanQin Email
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks, reject_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination
# Submission auth via Dovecot.
smtpd_sasl_type = dovecot
smtpd_sasl_path = inet:dovecot:12345
smtpd_sasl_auth_enable = yes
# 465/587 提交由 LanQin API 处理；Postfix 25 只负责入站和内部 relay。
smtpd_sasl_auth_enable = no
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level = may