Receiving a postfix error when emailing to a domain

Hi.

I run exchange 2013 and am receiving the following error when our users send emails to a certain domain. This issue just started a few hours ago:

This is the Postfix program at host example.xyz.ac.xx.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can delete your own text from the attached returned message.

                  The Postfix program

<user1@xyz.ac.xx>: host 1xx.1xx.x.1x[1xx.1xx.x.1x] said: 550 5.7.1 Message
    rejected due to content restrictions (in reply to end of DATA command)


Need any assistance n resolving this issue.

Thanks.
fijiboyAsked:
Who is Participating?
 
kenfcampConnect With a Mentor Commented:
Could also be an RBL listing,
Have you checked the IP of your mail server to see if it's listed on any black lists?

Check your mail server's IP on these lists
If you're routing mail through a service provider, use the IP identified in the error message

http://mxtoolbox.com/blacklists.aspx - Checks many lists
http://www.barracudacentral.org/lookups - Proprietary (Barracuda)
http://www.trustedsource.org/ - Proprietary (McAfee)
https://www.senderscore.org/blacklistlookup/ - Proprietary
http://www.senderbase.org/ - Proprietary (Cisco)
http://www.cyren.com/ip-reputation-check.html

Ken
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Veerappan SundaramSenior Technical ConsultantCommented:
Does your SMTP domain name has hypen (i.e.; abc-xyz.com)?
if yes, changing this would be difficult as immediate fix.

Have you created any email signature with logo or URL in it?
if yes, please remove and try to send a test email.

Thanks,
Veera.
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fijiboyAuthor Commented:
Hi Veera.

We tried resending but are getting the same error message.

Thanks.
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fijiboyAuthor Commented:
Our domain does not have a hyphen in it.
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fijiboyAuthor Commented:
I also tried emailing with a plain message but still get this error.
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Veerappan SundaramSenior Technical ConsultantCommented:
Is NDR from your Email gateway or from remote domain gateway server? - Where is this Postfix device?

If it is from remote domain, please check whether they can add your domain name/IP into their whitelist in Postfix.

Thanks,
Veera.
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fijiboyAuthor Commented:
Hi.
The postfix device is on the remote domain. Have checked my exchange server ip is not blacklisted.

Thanks.
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Veerappan SundaramConnect With a Mentor Senior Technical ConsultantCommented:
If it is only to one domain, please request the remote domain IT team to check why the emails from your domain are bouncing with Content Filtering message.
If possible, let them whitelist your email gateway.

You may need to call remote domain admin or send email from another email domain, i.e.; from Gmail or yahoo.

Thanks,
Veera.
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gheistCommented:
So you somehow trigger their content filter - some are paranoid about zip attachments renamed, including docx, some dislike exchange rich text etc. Can you capture message on outgoing mailer and check what is inside?
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