russian server cannot get verification from our local exchange server

had a user complain that all emails sent to a russian client are being baounced with the error message

Delivery has failed to these recipients or distribution lists:

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

The following organization rejected your message: fr58.aha.ru.

So was wondering if there was an issue with our server all other emails seem fine to email addresses in other countries.

many thanks

Mark
markgould1978Asked:
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Ernie BeekExpertCommented:
No issue with your server. As you can see from the message, the server on the other side has rejected the message for whatever reason (blacklist, domain blocked, etc). See if you can send email from another account (yahoo, gmail, etc). You could then ask the admin of that server if there's anything wrong.
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Tony JLead Technical ArchitectCommented:
You may have something misconfigured on your server that their antispam doesn't like.

Check out www.mxtoolbox.com and run some diagnostics on your mail domain and post back the results.
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markgould1978Author Commented:
many thanks appears that the company receiving the emails was on a blacklist
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