fix: support SMTP STARTTLS mode and NTLM auth (#5426)
* 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
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common/email_ntlm_auth.go
0 → 100644
common/email_test.go
0 → 100644
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