Can't send email using mail and sendmail

[Beralus]

[root@compname etc]# /sbin/service sendmail status
sendmail (pid 1415) is running...
sm-client (pid 1424) is running...
[root@compname etc]#

All settings are default .

A few times tried to send email like following:

mail -s hereSubject user@mailServer.com
here data
^D (ei . [dot])

but sendmail does not sends it
What is not correct? how to elaborate this problem ?

OS : FEdora Core 12

thank you for any attention

[root@compname etc]# mail
Heirloom Mail version 12.4 7/29/08. Type ? for help.
"/var/spool/mail/me": 1 message 1 new
>N 1 Mail Delivery Subsys Tue Mar 23 02:08 71/2457 "Returned mail: see tr"
& 1
Message 1:
From MAILER-DAEMON@localhost.localdomain Tue Mar 23 02:08:23 2010
Return-Path: <MAILER-DAEMON@localhost.localdomain>
Date: Tue, 23 Mar 2010 02:08:23 +0400
From: Mail Delivery Subsystem <MAILER-DAEMON@localhost.localdomain>
To: <me@localhost.localdomain>
Content-Type: multipart/report; report-type=delivery-status;
boundary="o2MM8NJc002325.1269295703/localhost.localdomain"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
Status: R

Part 1:

The original message was received at Tue, 23 Mar 2010 02:08:19 +0400
from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----
<HERE mail address which want to send>
(reason: 503 valid RCPT command must precede DATA)

[forkbomb]

Originally Posted by Beralus

All settings are default .

(reason: 503 valid RCPT command must precede DATA)

Search out that SMTP 503 error.

The short of it:
The default sendmail configuration on Fedora is so that it is not set up as an open relay. So, it won't route mail for non-authenticated users.

You need to either change the sendmail configuration to allow open relays (not recommended) or authenticate before attempting to get the sendmail daemon to route your email.


(Note: even if you fix the daemon on your side, if you have a residential internet service plan and live in the U.S., U.K., or some parts of Western Europe, there's a chance that your ISP will drop any outgoing emails destined for their mail servers.)