private async Task ConnectAsync(ISmtpClient client, EmailConfig.OutgoingConfig cfg,
CancellationToken cancellationToken)
{
_log.LogDebug("Connecting to mail server using {@Config}", cfg);
var socketOptions = client.ConfigureSecurity(cfg.UseSecureMode);
await Policy
.Handle <SocketException>().Or <System.IO.IOException>().Or <SslHandshakeException>()
.WaitAndRetryAsync(_retryConfig.Max, _ => _retryConfig.Delay,
(exc, delay, attempt, _) => _log.LogError(exc, Message.ConnError, attempt, cfg, delay))
.ExecuteAsync(token => client.ConnectAsync(cfg.ServerAddress, cfg.Port, socketOptions, token),
cancellationToken);
if (!string.IsNullOrWhiteSpace(cfg.Username) && !string.IsNullOrWhiteSpace(cfg.Password))
{
await Policy.Handle <SocketException>()
.WaitAndRetryAsync(_retryConfig.Max, _ => _retryConfig.Delay,
(exc, delay, attempt, _) => _log.LogError(exc, Message.AuthError, attempt, cfg, delay))
.ExecuteAsync(token => client.AuthenticateAsync(cfg.Username, cfg.Password, token),
cancellationToken);
}
}
