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?  
cali1Asked:
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omar_nagyCommented:

There is lot of reason for boucing of the mail Each email service have there own terms and policy regarding the incoming mail. First thing is to check your blacklisted or not. check the IP with Spam Blacklist and remove the blacklist then you will get everthing fine

http://www.mxtoolbox.com/blacklists.aspx

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cali1Author Commented:
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.
Kirti_SinghCommented:
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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jajjiiCommented:
Your domain is listed on one or more public spam servers, and as Omar explained, go to Mx toolbox and check if your domain is black listed and remove it.

What you need to understand is that not all the servers in the world have the same settings or rules when it comes to check incoming emails for spam.

One server can have one type of spam filter that will check certain black lists to see if your domain is black listed, while other servers might not even have a spam filter.

One server can allow spam to a certain degree, while another will have settings that are more strict than the others.

It might also be that the server that rejected your email carries a local database of emails to blacklist.

Check with the online tools to see if you are blacklisted, if not, contact the administrator of the domain that you need to email to and see if they can resolve the issue on their side.
jar3817Commented:
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?
cali1Author Commented:
The answers made sense outdid not fully solve resolve the issue.
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