NuGet package. Common Email functions based on MailKit.
.NET console app. Bulk Email merge based on Fonlow.Mail.
When testing Mail2Tests and BulkMailMerge.exe, please setup SMTP credentials in Secret.json based on:
<UserSecretsId>Fonlow.Mail2Tests20221223</UserSecretsId>.NEt runtime will use the key values in Secret.json to overwrite the ones in appsettings.json.