/// <summary>
/// Attaches a file to this email.
/// </summary>
public static async Task Attach(this IEmailMessage @this, Blob file)
{
if (file == null)
{
throw new ArgumentNullException(nameof(file));
}
if (file.IsEmpty())
{
return;
}
@this.Attach(await file.GetFileDataAsync(), file.FileName);
}