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cali1

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E-mail rejection-

I sent an e-mail to 3 addresses.  One was rejected - the code received was "smtp;550-Blacklisted:  currently sending spam.  Prior and subsequent e'mails to the same address were received.  What does this mean?  
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omar_nagy
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cali1

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Thank you Omar.  What I don't understand is that earlier in the day my mail to the same address was accepted.  After the rejection I reduced the size (short attachment) and resent and it went through.  Doesn't appear to be consistent.
What is the current status
Is it intermittent or for the current Email you are sending is also not received by the user
and still if you are not able to send mail to the remote user then check whether your exchange server is not sending Spam, not for only that domain also for other domain in the internet

If domain blacklist check shows that you are in blacklist, check with the spam configuration on your exchange server
and if the only for single domain you are getting this message then contact remote domain for resolution

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Just because the error message says "blacklisted...." doesn't mean you're listed in a public DNSBL server, it was just a reject message. The fact that you can send sometimes and not others makes me think you're getting rejected based on the content of the message.

You might have some config problems that would raise your score in programs like spamassassin and then the content could throw it over the edge. Can you post headers from a message sent from your server?
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The answers made sense outdid not fully solve resolve the issue.