public static async Task <SmtpClient> CreateConnectedSmtpClientAsync([NotNull] this RelayRule forwardRule, CancellationToken token)
{
if (forwardRule == null)
{
throw new ArgumentNullException(nameof(forwardRule));
}
var client = new SmtpClient();
await client.ConnectAsync(
forwardRule.SmtpServer,
forwardRule.SmtpPort,
forwardRule.SmtpUseSSL?SecureSocketOptions.Auto : SecureSocketOptions.None,
token);
// Note: since we don't have an OAuth2 token, disable
// the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
if (!string.IsNullOrWhiteSpace(forwardRule.SmtpPassword) &&
!string.IsNullOrWhiteSpace(forwardRule.SmtpUsername))
{
// Note: only needed if the SMTP server requires authentication
await client.AuthenticateAsync(forwardRule.SmtpUsername, forwardRule.SmtpPassword, token);
}
return(client);
}
public static void PopulateServerFromUri([NotNull] this RelayRule rule, string smtpServer)
{
if (rule == null)
{
throw new ArgumentNullException(nameof(rule));
}
var uri = new Uri("smtp://" + smtpServer);
rule.SmtpServer = uri.DnsSafeHost;
rule.SmtpPort = uri.IsDefaultPort ? 25 : uri.Port;
}