50 5.1.1 <bhaskara.rao@domain.com>... User unknown
 

----- Transcript of session follows -----
... while talking to [127.0.0.1]:
>>> DATA
<<< 550 5.1.1 <bhaskara.rao@domain.com>... User unknown
550 5.1.1 bhaskara.rao@domain.com... User unknown
<<< 503 5.0.0 Need RCPT (recipient)

--t2QG6Kp2022926.1427385981/testserver.domain.com
Content-Type: message/delivery-status

Reporting-MTA: dns; testserver.domain.com
Arrival-Date: Thu, 26 Mar 2015 22:06:20 +0600

Final-Recipient: RFC822; bhaskara.rao@domain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; [127.0.0.1]
Diagnostic-Code: SMTP; 550 5.1.1 <bhaskara.rao@domain.com>... User unknown
Last-Attempt-Date: Thu, 26 Mar 2015 22:06:21 +0600

--t2QG6Kp2022926.1427385981/testserver.domain.com
Content-Type: message/rfc822

Return-Path: <root>
Received: (from root@localhost)
by testserver.domain.com (8.14.4/8.14.4/Submit) id t2QG6Kp1022926
for bhaskara.rao@domain.com; Thu, 26 Mar 2015 22:06:20 +0600
From: root <root>
Message-Id: <201503261606.t2QG6Kp1022926@testserver.domain.com>
Date: Thu, 26 Mar 2015 22:06:20 +0600
To: bhaskara.rao@domain.com
Subject: Alert:Vertex tax link is not working
User-Agent: Heirloom mailx 12.4 7/29/08
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

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Welcome to LQ!!!

You have posted the delivery failure message. What exactly you want us to assist you with? You have to give us more details to dig in further.

Is the domain you sent email to managed by you? Do you follow the same naming convention as used in this email like: name.name@domain.com? Whenever you are posting a query make sure that you give enough details and what you are expecting.

Error while sending mails
 

Hi,
when i am trying to send a mil from linux server to my mail id i'm getting that Error.
Can you please help me on that issue.

and also can you please help me on the mail configuration like sendmail.mc file.
in y environment smtp server is different server. acutaly i'm sending a mail to my local machine

my smtp host is mail1.domain.com
test server testserver.domain.com

For setting up sendmail (I prefer postfix instead) you can refer the online documents. Here is one of them: http://computernetworkingnotes.com/n...il-server.html

For sending to your domain from outside you have to get your domain name registered with domain registrar. For sending it from your domain to outside world you still need to register your domain. Otherwise your IP will be blacklisted and destination mail server (for example gmail.com) will start bouncing your emails.

You can send internal emails without any issue but for sending or receiving it from outside you have to get your domain name registered. Apart from domain name you should have a valid mx record for your mail server. Make sure that reverse lookup works fine for your domain etc.

i'm not able to send to the mails internal from my linux client.

smtp configured in windows machine.

What you are trying to say, could you be more clear.

AS said by TERMINATOR u must have working dns server and valid mx records.