Here's a complete example on how to send an email:
VAR SMTP : TIdSMTP;
VAR MSG : TIdMSG;
.
.
MSG:=TIdMSG.Create(NIL);
TRY
WITH MSG.Recipients.Add DO BEGIN
Name:='<Name of recipient>';
Address:='<Email address of recipient>'
END;
MSG.BccList.Add.Address:='<Email address of Blind Copy recipient>';
MSG.From.Name:='<Name of sender>';
MSG.From.Address:='<Email address of sender>';
MSG.Body.Text:='<Message Body>';
MSG.Subject:='<Subject of message>';
SMTP:=TIdSMTP.Create(NIL);
TRY
SMTP.Host:='x.x.x.x'; // IP Address of SMTP server
SMTP.Port:=25; // Port address of SMTP service (usually 25)
SMTP.Connect;
TRY
SMTP.Send(MSG)
FINALLY
SMTP.Disconnect
END
FINALLY
SMTP.Free
END
FINALLY
MSG.Free
END;
.
.
(I know that WITH is frowned upon, but I generally use it in instances like this where there's no doubt as to what is going on, and where there's no (or just an infinitesimal) chance of ambiguity)