Not Able to send E-mail

[harsh]

I have some email Issues and I get following error from Gmail
I m not able to send mail

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
SMTP error from remote mail server after end of data:
host gmail-smtp-in.l.google.com [74.125.68.26]:
550-5.7.1 [49.248.5.37 12] Our system has detected that this message is
550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail,
550-5.7.1 this message has been blocked. Please visit
550 5.7.1 https://support.google.com/mail/answer/188131 for more information. ex7si8126587pdb.231 - gsmtp

------ This is a copy of the message, including all the headers. ------

Return-path: <[email protected]>
Received: from [192.168.1.1] (helo=[192.168.1.232])
by mysmiff with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256)
(Exim 4.82)
(envelope-from <[email protected]>)
id 1Z2Fvr-0001vR-EK
for [email protected]; Tue, 09 Jun 2015 15:04:55 +0530
From: Harsh Joshi <[email protected]>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Subject: Test
Message-Id: <[email protected]>
Date: Tue, 9 Jun 2015 15:04:36 +0530
To: Harsh Joshi <[email protected]>
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\))
X-Mailer: Apple Mail (2.2098)


It would be very helpful if you guide me
Thanks

[tjebbeke]

550-5.7.1 [49.248.5.37 12] Our system has detected that this message is
550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail,
550-5.7.1 this message has been blocked. Please visit
550 5.7.1 https://support.google.com/mail/answer/188131 for more information. ex7si8126587pdb.231 - gsmtp

The mail is blocked. Check https://support.google.com/mail/answer/188131
This is not vestacp error. This may be due to the mail you want to send. Or maybe your server is blacklisted.

Check your server her: http://mxtoolbox.com/blacklists.aspx

[skurudo]

Already discussed there:
viewtopic.php?f=12&t=8229&p=25723#p25722