public new async Task <bool> ConnectAsync()
{
await base.ConnectAsync();
var result = await ExecuteCommand(SmtpCommands.EHLO(Host));
return(result.Contains(SmtpResponse.ACTION_OK));
}
public async Task <bool> AuthenticateAsync(string userName, string password)
{
if (!UseSSL)
{
await UpgradeToSecureConnection();
}
await ExecuteCommand(SmtpCommands.EHLO(Host));
await ExecuteCommand(SmtpCommands.AUTHLOGIN());
await ExecuteCommand($"{ ToBase64(userName)}\r\n");
var result = await ExecuteCommand($"{ToBase64(password)}\r\n");
return(result.Contains(SmtpResponse.AUTHENTICATION_SUCCESS));
}
private async Task <bool> UpgradeToSecureConnection()
{
var upgradeResult = await ExecuteCommand(SmtpCommands.STARTTLS());
if (upgradeResult.Contains(SmtpResponse.SERVICE_READY))
{
UseSSL = true;
_stream = GetStream();
return(true);
}
else
{
throw new Exception("Could not upgrade SMTP non SSL connection using STARTTLS handshake");
}
}