Serilog.Settings.Configuration cannot deserialize NetworkCredential or
MailKit's SecureSocketOptions from JSON, causing an InvalidOperationException
in the binder and preventing containers from starting.
Fix: remove Email from the WriteTo JSON array entirely and wire it in code
inside ConfigureJsonSerilog using a dedicated SerilogEmail:* config section.
The sink is skipped when From/To/Host are absent, so local dev is unaffected.
Also renames the docker-compose env vars from the verbose
Serilog__WriteTo__2__Args__* prefix to the clean SerilogEmail__* prefix.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Serilog.Sinks.Email v4 renamed all configuration parameters from their
v2 names. The old names were silently ignored, so no error alert emails
were ever sent.
Parameter renames applied across all 6 appsettings.json and docker-compose:
fromEmail → from
toEmail → to
mailServer → host
networkCredential → credentials
enableSsl: true → connectionSecurity: StartTls
emailSubject → subject
outputTemplate → body
batchPostingLimit / period removed (v4 batching uses a separate overload)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
claude