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feat: add SMTP submission listener and enhance stalwart configuration #425

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unkinben merged 1 commits from benvin/stalwart_submission into develop 2025-11-09 18:48:06 +11:00
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Author SHA1 Message Date
Ben Vincent
368a8a5e89 feat: add SMTP submission listener and enhance stalwart configuration
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Details 
- add SMTP submission listener on port 587 with TLS requirement
- configure HAProxy frontend/backend for submission with send-proxy-v2 support
- add send-proxy-v2 support to all listeners
- add dynamic HAProxy node discovery for proxy trusted networks
- use service hostname instead of node FQDN for autoconfig/autodiscover
- remove redundant IMAP/IMAPS/SMTP alt-names from TLS certificates
- update VRRP CNAME configuration to use mail.main.unkin.net
 2025-11-09 17:04:16 +11:00