Problem in sending email

[egsuh]

Hello,
I'm trying to send email using synapse.

Code: Pascal  [Select][+][-]

1. procedure TEmailForm.Button1Click(Sender: TObject);
2. begin
3.      if SendTo('info@brio.co.kr', leTo.Text,
4.                 leSubject.Text,
5.                 'webmail.brio.co.kr',
6.                 Memo1.Lines)
7.      then ShowMessage('Mail Sent')
8.      else ShowMessage('Failed');
9. end;
10.  

leTo.Text is the recipients' addresses. The mail is sent only when the domain of recipients are the same as that of sender. so I can send email to abc@brio.co.kr, but not to  any other address like def@gmail.com.

Any possible reason? It may be not the problem of Lazarus or Synapse. Instead it may come from mail server (in this case webmail.brio.co.kr). 

Interesting thing is that I could send email to other addresses in the morning.

[egsuh]

I think I found the reason --- some mail servers require SMTP authentification. So I have to use SendToEx instead of SendTo.