error when sending mail with NMSmtp component

[samibami]

hi there ...

i'm using bcb5 to create a mail program.i use "fast net" component called "NMSmtp".i configured host name to b "mail" .the problem accures when i try to send mail between 2 diffrent mail accounts.

i.e :

NMSMTP1->PostMessage->FromName="my name";
NMSMTP1->PostMessage->ToAddress->Text =
"hisaddress@hotmail.com";
NMSMTP1->PostMessage->FromAddress ="myaddress@doal.co.il";
NMSMTP1->PostMessage->Subject = "whatever";
NMSMTP1->PostMessage->Body->Add(Memo1->Text);
NMSMTP1->Connect();


i get "503 no recipient(s)" error message.
what is the problem here?

sometimes i get "header incomplete" error message.
what does it mean?