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