Benson Yan
2f23a66733
* fix: support SMTP STARTTLS mode and NTLM auth Add explicit SMTP STARTTLS configuration for 587-style connections and keep SSL/TLS as the implicit TLS mode. Prefer PLAIN when advertised, keep LOGIN compatibility, and add NTLM as a fallback for Exchange SMTP servers that require it after STARTTLS. * fix: respect explicit SMTP encryption mode * fix: preserve SMTP TLS compatibility